alternative_right writes: A new technology has been proposed that could fundamentally solve the issue of smartphones overheating during high-spec gaming or extended video streaming. Researchers at KAIST have discovered the principle of processing signals using the minute vibrations of magnets (spin waves) instead of electrons. This method significantly reduces heat generation and power consumption while enabling instantaneous frequency switching within the several GHz range. This breakthrough is expected to pave the way for smart devices with less heat and longer battery life, as well as ultra-low-power, high-speed computing. Professor Kab-Jin Kim from the Department of Physics said: "This study is a case that proves we can implement and control the nonlinear dynamics of magnons -- the principle of information processing using magnetic vibrations -- in actual nano-devices, which had previously only been proposed in theory. It will serve as an important foundation for the development of a new information processing paradigm using spin waves instead of electrons."

The findings have been published in the journal Nature Communications.

An anonymous reader quotes a report from the Guardian: A ban on mobile phones in schools in England is to be introduced by the government to ensure that "critical safeguarding legislation" is passed. The government will table an amendment to the children's wellbeing and schools bill in the House of Lords after the bill was held up by peers on opposition benches. It will make existing guidance on mobile phone bans in schools statutory, a move that ministers have resisted until now.

The government had consistently argued that the vast majority of schools had already banned mobile phones, and that there was no need to add a legal requirement. They finally capitulated, however, describing it as "a pragmatic measure" to get the bill through. [...] The bill is regarded by many as the biggest piece of child protection legislation in decades and includes proposals for a compulsory register for children who are not in school, a crackdown on profiteering in children's social care, and a "single unique identifier" to help agencies track a child's welfare.

"Nevada quietly signed an agreement earlier this year with a company that collects location data from cellphones, allowing police to track a device virtually in real time," reports the Associated Press. "All without a warrant." The software from Fog Data Science, adopted this January in Nevada through a Department of Public Safety contract, pulls information from smartphone apps in order to let state investigators identify the location of mobile devices. The state is allowed more than 250 queries a month using the tool, which allows officers to track a device's location over long stretches of time and enables them to see what Fog calls "patterns of life," according to company documents from 2022. It can help them deduce where and when people work and live, with whom they associate and what places they visit, according to privacy experts... Traditionally, police must obtain a warrant from a judge to access cellphone location information — a process that can take days or weeks. And while cellphone users may be aware that they are sharing their location through apps such as Google Maps, critics say few are aware that such information can make its way to police...

Other agencies in Nevada have been known to use technology similar to Fog. In 2013, Las Vegas Metropolitan Police Department acquired something known as a cell-site simulator that mimics cellphone towers and can sweep up signals from entire areas to track individuals, with some models capable of intercepting texts and calls. Police have not released detailed information about the technology since then.
"Police in other states have said the technology (and its low price tag) has helped expand investigatory capacity," the article adds.

But it also points out that Fog Data Science has a web page letting individuals opt out of all their data sets.

The Associated Press looks at the small-but-growing "rebellion" against attention-hogging devices, citing "a growing body of literature calling for people to move away from screens and pay attention to life." D. Graham Burnett is a historian of science at Princeton University and one of the authors of " Attensity! A Manifesto of the Attention Liberation Movement," making him a pillar of the growing backlash against the corporate harvesting of human attention. Along with MS NOW host Chris Hayes' bestselling " The Sirens' Call: How Attention Became the World's Most Endangered Resource," his work is part of a growing body of literature calling for people to move away from screens and pay attention to life. Burnett says the "attention liberation movement" is about throwing off the yoke of time-sucking apps. People "need to rewild their attention. Their attention is the fullness of their relationship to the world"....

There are several dozen "attention activism" groups across the United States and Canada, and the movement has also cropped up in Spain, Italy, Croatia, France and England. Burnett said he expects it to spread further.
Some examples cited in the article:

• "More than a dozen millennials gathered in a brownstone apartment in Brooklyn and placed their phones in a metal colander before two hours of reading, drawing and conversation."

• A few miles away "Nearly 20 people in their 30s stared at their cellphones for a few minutes. Then they set them down and looked at their bared palms for a while. Then those of their neighbors."

Thanks to long-time Slashdot reader destinyland for sharing the article.

Samsung says it's thinking about bringing "vibe coding" to future Galaxy phones, allowing users to describe apps or interface changes in plain language and have AI generate the code. TechRadar interviewed Won-Joon Choi, Samsung's head of mobile experience, to learn more about the plans. Here's an excerpt from their report: As noted by Won-Joon Choi, the usefulness of vibe coding on smartphones is that it opens up the "possibility of customizing your smartphone experience in new ways, not just your apps but your UX." He added, "Right now we're limited to premade tools, but with vibe coding, users could adjust their favorite apps or make something customized to their needs. So vibe coding is very interesting, and something we're looking into." [...]

Samsung recently debuted the Galaxy S26 series of phones and made a point to not call them smartphones -- they're "AI phones" now. This certainly rang true with the majority of upgrades to the devices being AI software-focused, like the new Now Nudge and expanded Audio Eraser tools, with the biggest hardware bump for the base models coming via the 39% improved NPU processing (the processor in charge of on-device AI tasks). It also teased the debut of Perplexity on its phones, joining as an alternative to the Gemini assistant, and teased the possibility of other AI models getting the same treatment in the future.

An anonymous reader quotes a report from U.S. News & World Report: U.S. health officials plan a new study investigating whether radiation from cellphones may affect human health. A spokesperson for the U.S. Department of Health and Human Services (HHS) said the research will examine electromagnetic radiation and possible gaps in current science. The initiative stems from numerous concerns raised by Health Secretary Robert F. Kennedy Jr., who has linked cellphone use to neurological damage and cancer.

"The [U.S. Food and Drug Administration] removed webpages with old conclusions about cell phone radiation while HHS undertakes a study on electromagnetic radiation and health research to identify gaps in knowledge, including on new technologies, to ensure safety and efficacy," HHS spokesman Andrew Nixon said. He added that the study was directed in a strategy report from the president's Make America Healthy Again Commission.

Some webpages from the FDA and the U.S. Centers for Disease Control and Prevention say current research does not show clear harm from cellphone radiation. The National Cancer Institute, which is part of the National Institutes of Health, says that "evidence to date suggests that cellphone use does not cause brain or other kinds of cancer in humans.".

Last June the Trump organization announced sales of a $499 "T1" smartphone with a gold-colored case. But though they originally were scheduled for release in August, this week a customer service representative for the wireless carrier told CBS News the device will be pushed back again, now until the end of January, "attributing the delay to the recent U.S. government shutdown."

Some context from The Independent: Shortly after the phone was first announced, language describing it as "Made in the USA" was removed from its official website with the vague claim that the devices are "brought to life" in the United States posted in its place... Other information about the phone has also changed or been removed since its first unveiling, The Verge has reported. Trump Mobile initially indicated the T1's screen measured 6.78 inches, but now claims it is 6.25 inches. It also said the phone had 12GB of RAM; however, that claim has now also disappeared.

As the wait for the T1 continues, Trump Mobile has begun offering refurbished Samsung S23s, S24s, and Apple iPhone 15s and 16s for sale on its site, which appear to have no specific Trump branding and are priced considerably higher than customers might pay elsewhere.

An anonymous reader shared this report from The Guardian: A Texas father used the parental controls on his teenage daughter's cell phone to find and help rescue her after she was kidnapped at knifepoint while walking her dog on Christmas, authorities allege... Her father subsequently located her phone through the device's parental controls, the agency's statement said. The phone was about 2 miles (3.2km) away from him in a secluded, partly wooded area in neighboring Harris county... She then managed to escape with a hand from her father, who called law enforcement officials, said the statement from the Montgomery sheriff's office.
The suspect has since been arrested and charged.

Jolla is "trying again with a new crowd-funded smartphone," reports Phoronix: Finnish company Jolla started out 14 years ago where Nokia left off with MeeGo and developed Sailfish OS as a new Linux smartphone platform. Jolla released their first smartphone in 2013 after crowdfunding but ultimately the Sailfish OS focus the past number of years now has been offering their software stack for use on other smartphone devices [including some Sony Xperia smartphones and OnePlus/Samsung/ Google/ Xiaomi devices].
This new Jolla Phone's pre-order voucher page says the phone will only produced if 2,000 units are ordered before January 4. (But in just a few days they've already received 1,721 pre-orders — all discounted to 499€ from a normal price between 599 and 699 €). Estimate delivery is the first half of 2026. "The new Jolla Phone is powered by a high-performing Mediatek 5G SoC," reports 9to5Linux, "and features 12GB RAM, 256GB storage that can be expanded to up to 2TB with a microSDXC card, a 6.36-inch FullHD AMOLED display with ~390ppi, 20:9 aspect ratio, and Gorilla Glass, and a user-replaceable 5,500mAh battery." The Linux phone also features 4G/5G support with dual nano-SIM and a global roaming modem configuration, Wi-Fi 6 wireless, Bluetooth 5.4, NFC, 50MP Wide and 13MP Ultrawide main cameras, front front-facing wide-lens selfie camera, fingerprint reader on the power key, a user-changeable back cover, and an RGB indication LED. On top of that, the new Jolla Phone promises a user-configurable physical Privacy Switch that lets you turn off the microphone, Bluetooth, Android apps, or whatever you wish.

The device will be available in three colors, including Snow White, Kaamos Black, and The Orange. All the specs of the new Jolla Phone were voted on by Sailfish OS community members over the past few months. Honouring the original Jolla Phone form factor and design, the new model ships with Sailfish OS (with support for Android apps), a Linux-based European alternative to dominating mobile operating systems that promises a minimum of 5 years of support, no tracking, no calling home, and no hidden analytics...

The device will be manufactured and sold in Europe, but Jolla says that it will design the cellular band configuration to enable global travelling as much as possible, including e.g. roaming in the U.S. carrier networks. The initial sales markets are the EU, the UK, Switzerland, and Norway.

What happened when a school in Los Angeles gave a sixth grader an iPad for use throughout the school day? "He used the iPad during school to watch YouTube and participate in Fortnite video game battles," reports NBC News.

His mother has now launched a coalition of parents called Schools Beyond Screens "organizing in WhatsApp groups, petition drives and actions at school board meetings and demanding meetings with district administrators, pressuring them to pull back on the school-mandated screen time." Los Angeles Unified is the first district of its size to face an organized — and growing — campaign by parents demanding that schools pull back on mandatory screen time. The discontent in Los Angeles Unified, the second-largest school district in the country, reflects a growing unease nationally about the amount of time children spend learning through screens in classrooms. While a majority of states prohibit children from using cellphones in class, 88% of schools provide students with personal devices, according to the National Center for Education Statistics, often Chromebook laptops or iPads. The parents hope getting a district that has over 409,000 students across nearly 800 schools to change how it approaches screen time would send a signal across public school districts to pull back from a yearslong effort to digitize classrooms....

[In the Los Angeles school district] Students in grade levels as low as kindergarten are provided iPads, and some schools require them to take the tablets home. Some teachers have allowed students to opt out of the iPad-based assignments, but other parents say they've been told that they can't. Parents can also opt their children out of having access to YouTube and several other Google products... The billion-dollar 2014 initiative to give tablet computers to everyone became a scandal after the bidding process appeared to heavily favor Apple, and it faced criticism once it became clear that students could bypass security protocols and that few teachers used the tablets. Currently, the district leaves it up to individual schools to decide whether they want students to take home iPads or Chromebooks every day and how much time they spend on them in class...

Around 300 parents attended listening sessions the district held last month about technology in the classroom. Nearly all who spoke criticized how much screen time schools gave their children in class, pointing to ways their behavior and grades suffered as students watched YouTube and played Minecraft... Several also asked district officials to explain why children as young as kindergartners were asked to sign a form to use devices in which they promised they would honor intellectual property law and refrain from meeting people in person whom they met online. "Is it possible for children to meet people over the internet on school-issued devices?" one father asked. The district officials declined to answer, saying it was meant to be a listening session.
In 2022, Los Angeles Unified started requiring students to complete benchmark assessments on educaitonal software i-Ready, the article points out, which generates unique questions for each students. "But parents and teachers are unable to see what children are asked, in part because the company that makes the program considers them proprietary information..."

One teacher says his school's administartors are requiring him to use i-Ready even though it doesn't have any material for the science class he's actually teaching. He's also noticed some students will use answers from AI chatbots, bypassing the school's monitoring software by creating alternate user profiles. But the monitoring software company suggests the school misconfigured their software's settings, adding "More commonly, when students attempt to bypass filtering or monitoring, they do so by using proxies."

Thanks to long-time Slashdot reader schwit1 for sharing the article.

CNN's prediction for 2026? "Any device that uses memory, from phones to tablets and smartwatches, could get pricier." But will it be a little or a lot?

The article cites an analysis from multinational strategy/management consulting firm McKinsey & Company which found America's data center demand could continue growing by 20 to 25 percent per year" through 2030. "That's prompted memory manufacturers like Micron and Samsung to shift their focus to data centers, which use a different type of memory, meaning fewer resources for consumer products. (Jaejune Kim, executive VP for memory at Samsung, said in October that their third quarter saw strong demand for memory for AI and data centers, and that they expected the supply shortage for mobile and PC memory to "intensify further.") Memory prices are rising for consumer products because major manufacturers are instead ramping up production for AI data centers as artificial intelligence companies boom. "It's pretty much brutal and crunched across the board," said Yang Wang, a senior analyst at Counterpoint Research.

The International Data Corporation, a global market research firm, reported earlier this week that the smartphone market is expected to decline by 0.9% in 2026 in part because of memory shortages. Memory prices are expected to surge by 30% in the fourth quarter of 2025 and may climb an additional 20% early next year, Counterpoint Research said last month... TrendForce, a research firm that follows the semiconductor industry, estimates memory price hikes have made smartphones 8% to 10% more expensive to produce in 2025 (higher production costs don't always translate into higher consumer prices for a variety of reasons).

Some smartphones could cost more as soon as early next year, said Nabila Popal, a senior research director for the International Data Corporation. Cheap Android phones may see the biggest impact, since less expensive products usually have thinner margins. "It's going to be almost impossible for them to not raise prices" of cheaper Android phones, said Popal. Companies may also postpone phone launches to focus on expensive models that may be more profitable. The average selling price for smartphones is expected to climb to $465 in 2026, compared to $457 in 2025, according to Popal, putting the smartphone market at a record high value of $578.9 billion.

But the pendulum is expected to swing back in the other direction late next year as the supply chain adjusts, according to Popal and Wang, potentially bringing prices back down or at least capping increases.

India is weighing a proposal to mandate always-on satellite tracking in smartphones for precise government surveillance -- an idea strongly opposed by Apple, Google, Samsung, and industry groups. Reuters reports: For years, the [Prime Minister Narendra Modi's] administration has been concerned its agencies do not get precise locations when legal requests are made to telecom firms during investigations. Under the current system, the firms are limited to using cellular tower data that can only provide an estimated area location, which can be off by several meters.

The Cellular Operators Association of India (COAI), which represents Reliance's Jio and Bharti Airtel, has proposed that precise user locations should only be provided if the government orders smartphone makers to activate A-GPS technology -- which uses satellite signals and cellular data -- according to a June internal federal IT ministry email. That would require location services to always be activated in smartphones with no option for users to disable them. Apple, Samsung, and Alphabet's Google have told New Delhi that should not be mandated, said three of the sources who have direct knowledge of the deliberations.

A measure to track device-level location has no precedent anywhere else in the world, lobbying group India Cellular & Electronics Association (ICEA), which represents both Apple and Google, wrote in a confidential July letter to the government, which was viewed by Reuters. "The A-GPS network service ... (is) not deployed or supported for location surveillance," said the letter, which added that the measure "would be a regulatory overreach." Earlier this week, Modi's government was forced to rescind an order requiring smartphone makers to preload a state-run cyber safety app on all devices after public backlash and privacy concerns.

A severe spike in global DRAM prices has pushed Samsung Semiconductor to refuse a long-term RAM order from its own sibling, Samsung Electronics. The move is forcing the smartphone division into short, expensive renegotiations, which will likely mean higher costs for consumer devices. PCWorld reports: Samsung subsidiaries are, naturally, going to look to Samsung Semiconductor first when they need parts. Such was reportedly the case for Samsung Electronics, in search of memory supplies for its newest smartphones as the company ramps up production for 2026 flagship designs. But with so much RAM hardware going into new "AI" data centers -- and those companies willing to pay top dollar for their hardware -- memory manufacturers like Samsung, SK Hynix, and Micron are prioritizing data center suppliers to maximize profits.

The end result, according to a report from SE Daily spotted by SamMobile, is that Samsung Semiconductor rejected the original order for smartphone DRAM chips from Samsung Electronics' Mobile Experience division. The smartphone manufacturing arm of the company had hoped to nail down pricing and supply for another year. But reports say that due to "chipflation," the phone-making division must renegotiate quarterly, with a long-term supply deal rejected by its corporate sibling. A short-term deal, with higher prices, was reportedly hammered out.

AT&T and Verizon are blocking T-Mobile's new "Switching Made Easy" tool that scans their customer accounts to recommend comparable plans. AT&T is also suing, alleging T-Mobile used bots to scrape over 100 fields of sensitive customer data. From The Mobile Report: According to a lawsuit, which AT&T has shared directly with us, T-Mobile updated the T-Life app's scraping abilities three separate times in an attempt to bypass AT&T's detection. Essentially, T-Mobile and AT&T have been in a game of cat and mouse. Not only that, but AT&T alleges that T-Mobile is intentionally hiding the fact that it's their scraper accessing an account, and essentially pretends to be an end user while doing so. Apparently, T-Mobile's scraping bot tries its best to appear as a generic web browser.

AT&T sent T-Mobile a cease and desist letter on November 24th demanding T-Mobile stop the scraping process. T-Mobile responded two days later refusing, stating that the process was legal because "customers themselves ... log into their own wireless account." On November 26th, AT&T says they detected T-Mobile is no longer scraping the AT&T website, and instead asks users to upload a pdf of their bill or enter some info manually. They note, however, that at the time the app still appeared to scrape Verizon accounts. The lawsuit further explains that AT&T reached out to Apple with the claim that T-Mobile's T-Life app is also violating the App Store Review Guidelines. T-Mobile responded to this complaint as well, making similar claims that the scraping process does not violate those guidelines. [...]

According to AT&T, the T-Life app collects way more information than is necessary for a simple carrier switch. The company alleges T-Mobile grabs over 100 separate bits of info from a customer's account, including info about other users on the account and other services not related to wireless service. It's also worth noting that, apparently, T-Mobile is storing this information, not just using it temporarily, even if the customer doesn't end up switching. T-Mobile has responded to our request for comment, and says that actually, AT&T is wrong about the facts, and Easy Switch is safe and secure...

Apple does not plan to comply with India's mandate to preload its smartphones with a state-owned cyber safety app that cannot be disabled. According to Reuters, the order "sparked surveillance concerns and a political uproar" after it was revealed on Monday. From the report: In the wake of the criticism, India's telecom minister Jyotiraditya M. Scindia on Tuesday said the app was a "voluntary and democratic system," adding that users can choose to activate it and can "easily delete it from their phone at any time." At present, the app can be deleted by users. Scindia did not comment on or clarify the November 28 confidential directive that ordered smartphone makers to start preloading it and ensure "its functionalities are not disabled or restricted."

Apple however does not plan to comply with the directive and will tell the government it does not follow such mandates anywhere in the world as they raise a host of privacy and security issues for the company's iOS ecosystem, said two of the industry sources who are familiar with Apple's concerns. They declined to be named publicly as the company's strategy is private. "Its not only like taking a sledgehammer, this is like a double-barrel gun," said the first source.

At an event in Seoul on Tuesday, Samsung unveiled the Galaxy Z TriFold, a dual-hinged smartphone that unfolds into a 10-inch tablet (source paywalled; alternative source). It launches on Dec. 12 in Korea for about $2,450. The company plans to sell the phone in the U.S., but hasn't shared pricing. Bloomberg reports: Samsung's device has a different hinge design, folding inward from two sides whereas the Mate models take on a Z shape when being folded. When closed, the TriFold's outer screen offers similar dimensions to a regular smartphone. But when unfurled, it provides a tablet-style experience with a 10-inch display, larger than the panel on the Galaxy Z Fold 7. In the tablet-like mode, each of the device's screens can independently run a different app. This provides the equivalent of three separate 6.5-inch bar-style handsets side by side.

Using Samsung's DeX software, which has been tweaked for this particular hardware type, you can also run a desktop-like experience directly on the large inner display. (Other Samsung phones must be plugged into an external monitor to activate DeX mode.) In DeX, the TriFold can operate as many as four distinct workspaces that can each run five apps simultaneously. To preempt concerns about potential breakage, Samsung said it has refined the phone's hinges, aluminum frame and display technology to improve long-term durability. The company will also offer a one-time 50% discount on display repair costs should one eventually be needed.

At its thinnest point, the TriFold measures 3.9 millimeters (0.15 inch). Inside, it contains a 5,600 milliamp-hour battery, marking the largest capacity that Samsung has used in a folding phone so far. The battery provides as much as 17 hours of consecutive video playback with the TriFold display fully open. However, in specifications shared with Bloomberg, the company didn't say how long it expects the battery to last with typical usage.

A new study from the University of Pennsylvania finds that preteens who own smartphones by age 12 have significantly higher odds of depression, obesity, and poor sleep compared to their peers. Axios reports: Kids who owned a smartphone at age 12 were found to have about 31% higher odds of depression, 40% higher odds of obesity and 62% higher odds of insufficient sleep than their peers who didn't have one. The researchers analyzed data from the National Institutes of Health-supported Adolescent Brain Cognitive Development Study assessments conducted between 2016 and 2022. The study included responses from 10,588 youths. Kids who had smartphones were more likely to be female, Black or Hispanic, and from lower-income households. The study has been published in the journal Pediatrics.

An anonymous reader quotes a report from 404 Media: Someone recently managed to get on a Microsoft Teams call with representatives from phone hacking company Cellebrite, and then leaked a screenshot of the company's capabilities against many Google Pixel phones, according to a forum post about the leak and 404 Media's review of the material. The leak follows others obtained and verified by 404 Media over the last 18 months. Those leaks impacted both Cellebrite and its competitor Grayshift, now owned by Magnet Forensics. Both companies constantly hunt for techniques to unlock phones law enforcement have physical access to.

"You can Teams meeting with them. They tell everything. Still cannot extract esim on Pixel. Ask anything," a user called rogueFed wrote on the GrapheneOS forum on Wednesday, speaking about what they learned about Cellebrite capabilities. GrapheneOS is a security- and privacy-focused Android-based operating system. rogueFed then posted two screenshots of the Microsoft Teams call. The first was a Cellebrite Support Matrix, which lays out whether the company's tech can, or can't, unlock certain phones and under what conditions. The second screenshot was of a Cellebrite employee. According to another of rogueFed's posts, the meeting took place in October. The meeting appears to have been a sales call. The employee is a "pre sales expert," according to a profile available online.

The Support Matrix is focused on modern Google Pixel devices, including the Pixel 9 series. The screenshot does not include details on the Pixel 10, which is Google's latest device. It discusses Cellebrite's capabilities regarding 'before first unlock', or BFU, when a piece of phone unlocking tech tries to open a device before someone has typed in the phone's passcode for the first time since being turned on. It also shows Cellebrite's capabilities against after first unlock, or AFU, devices. The Support Matrix also shows Cellebrite's capabilities against Pixel devices running GrapheneOS, with some differences between phones running that operating system and stock Android. Cellebrite does support, for example, Pixel 9 devices BFU. Meanwhile the screenshot indicates Cellebrite cannot unlock Pixel 9 devices running GrapheneOS BFU. In their forum post, rogueFed wrote that the "meeting focused specific on GrapheneOS bypass capability." They added "very fresh info more coming."

Nvidia is taking a $1 billion stake in Nokia, sending the Finnish telecom giant's shares up 22%. The two companies also struck a partnership to co-develop next-generation 6G and AI-driven networking technology. CNBC reports: The two companies also struck a strategic partnership to work together to develop next-generation 6G cellular technology. Nokia said that it would adapt its 5G and 6G software to run on Nvidia's chips, and will collaborate on networking technology for AI. Nokia said Nvidia would consider incorporating its technology into its future AI infrastructure plans. Nokia, a Finnish company, is best known for its early cellphones, but in recent years, it has primarily been a supplier of 5G cellular equipment to telecom providers.

A new study from the Complexity Science Hub Vienna finds that as people's close social circles expanded from two to five friends around the rise of social media (2008-2010), polarization in society spiked. "The connection between these two developments could provide a fundamental explanation for why societies around the world are increasingly fragmenting into ideological bubbles," reports Phys.org. From the report: The researchers' findings confirm that increasing polarization is not merely perceived -- it is measurable and objectively occurring. "And this increase happened suddenly, between 2008 and 2010," says [says Stefan Thurner from the Complexity Science Hub (CSH)]. The question remained: what caused it? [...] The sharp rise in both polarization and the number of close friends occurred between 2008 and 2010 -- precisely when social media platforms and smartphones first achieved widespread adoption. This technological shift may have fundamentally changed how people connect with each other, indirectly promoting polarization.

"Democracy depends on all parts of society being involved in decision-making, which requires that everyone be able to communicate with each other. But when groups can no longer talk to each other, this democratic process breaks down," emphasizes Stefan Thurner. Tolerance plays a central role. "If I have two friends, I do everything I can to keep them -- I am very tolerant towards them. But if I have five and things become difficult with one of them, it's easier to end that friendship because I still have 'backups.' I no longer need to be as tolerant," explains Thurner.

What disappears as a result is a societal baseline of tolerance -- a development that could contribute to the long-term erosion of democratic structures. To prevent societies from increasingly fragmenting, Thurner emphasizes the importance of learning early how to engage with different opinions and actively cultivating tolerance. The research was published in Proceedings of the National Academy of Sciences.