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T-Mobile hacked by Chinese cyber espionage in major attack on US telecoms

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T-Mobile hacked by Chinese cyber espionage in major attack on US telecoms

The telecom industry is one of cybercriminals’ favorite targets, likely because of the sensitive data it stores. Your carrier knows what you search for on the web, which websites you visit, who you call and what you text. This type of information is valuable not only to hackers but also to governments. That’s probably why U.S. phone giant T-Mobile was hacked as part of a broad cyberattack on domestic and international phone and internet companies in recent months.

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T-Mobile booth (T-Mobile) (Kurt “CyberGuy” Knutsson)

What you need to know

T-Mobile’s network was compromised in a major Chinese cyber-espionage operation targeting multiple U.S. and international telecommunications companies, according to a report that cited sources familiar with the matter.

The report revealed that hackers connected to a Chinese intelligence agency breached T-Mobile as part of a monthslong effort to spy on the cellphone communications of high-value intelligence targets. However, the report did not specify when the attack occurred, and it remains unclear whether any information about T-Mobile customers’ calls or communication records was stolen.

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The U.S. government also confirmed this month that Chinese hackers breached multiple U.S. telecommunications service providers to access wiretap systems used by law enforcement for surveillance of Americans. Wiretap systems allow law enforcement agencies to monitor phone calls, text messages and internet communications as part of investigations, typically with a warrant. 

CISA (Cybersecurity and Infrastructure Security Agency) and the FBI issued a joint statement revealing “a broad and significant” cyber espionage campaign. The statement disclosed that PRC-affiliated hackers had breached networks at “multiple telecommunications companies” across the United States. While CISA and the FBI did not name the organizations affected, multiple reports suggest that T-Mobile, AT&T, Lumen (formerly CenturyLink) and Verizon are likely on the list.

WSJ reported in October that Chinese hackers had access to the networks “for months or longer,” enabling them to collect “internet traffic from internet service providers that count businesses large and small and millions of Americans as their customers.”

Illustration of a hacker at work (Kurt “CyberGuy” Knutsson)

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T-Mobile’s many data breaches

T-Mobile has faced several hacks in recent years. In 2021, a malicious actor breached T-Mobile’s lab environment by posing as a legitimate connection to an unidentified piece of equipment. The hacker guessed passwords for multiple servers and moved laterally through the network, ultimately stealing personal data, including names, addresses, Social Security numbers and driver’s license IDs, from tens of millions of customers.

In 2022, T-Mobile experienced another breach when a malicious actor used SIM-swapping, phishing and other tactics to infiltrate the company’s internal platform for managing mobile resellers who serve T-Mobile customers.

The troubles continued into 2023. Early in the year, hackers used phished credentials from dozens of T-Mobile retail employees to access a sales application originally set up during the COVID-19 pandemic for remote viewing of customer data. Then, in January 2023, a misconfigured application programming interface exposed personal data for 37 million current customers, marking yet another significant security lapse.

Illustration of a hacker at work (Kurt “CyberGuy” Knutsson)

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T-Mobile’s response

When CyberGuy reached out to T-Mobile regarding the latest security incident, a spokesperson provided the following statement: “T-Mobile is closely monitoring this industry-wide attack. Due to our security controls, network structure and diligent monitoring and response we have seen no significant impacts to T-Mobile systems or data. We have no evidence of access or exfiltration of any customer or other sensitive information as other companies may have experienced. We will continue to monitor this closely, working with industry peers and the relevant authorities.”

WHAT TO DO IF YOUR BANK ACCOUNT IS HACKED

5 ways to stay safe amid the rise in telecom data breaches

1) Change your passwords regularly: Make it a habit to update your passwords every few months, especially for your telecom accounts and related services. Use strong, unique passwords that include a mix of letters, numbers and symbols. Password managers can help you generate and store these securely.

2) Invest in personal data removal services: Consider services that scrub your personal information from public databases. This reduces the chances of your data being exploited in phishing or other cyberattacks after a breach. Check out my top picks for data removal services here.

3) Use identity theft protection: Identity theft protection services monitor your accounts for unusual activity, alert you to potential threats and can even assist in resolving issues if your data is compromised. See my tips and best picks on how to protect yourself from identity theft.

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4) Enable two-factor authentication (2FA): Add an extra layer of security to your telecom accounts with 2FA. This requires a second form of verification, like a text code or an app-based prompt, making it harder for hackers to access your accounts even if they have your password.

5) Guard against phishing scams with strong antivirus software: Be cautious about unsolicited calls, texts or emails that ask for personal information or account access. Legitimate companies won’t ask for sensitive details this way. If something seems off, contact your telecom provider directly through official channels. Whatever you do, don’t click on links, as they can lead to scams or malware.

The best way to safeguard yourself from malicious links that install malware, potentially accessing your private information, is to have strong antivirus software installed on all your devices. This protection can also alert you to phishing emails and ransomware scams, keeping your personal information and digital assets safe. Get my picks for the best 2024 antivirus protection winners for your Windows, Mac, Android and iOS devices.

Kurt’s key takeaway

Telecom providers like T-Mobile and AT&T are frequent targets for hackers. Over the last two years, millions of Americans have had their data stolen, things like call records, text messages and even personal details. The issue got so bad that the FCC stepped in, warning T-Mobile to step up its cybersecurity efforts. The company was fined about $30 million, split between a $15 million penalty and a mandatory $15 million investment in better security. Unfortunately, if the companies handling your data keep getting breached, there’s only so much you can do.

Do fines and penalties for telecom companies feel like enough of a deterrent, or should they face stricter consequences? Let us know by writing us at Cyberguy.com/Contact.

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For more of my tech tips and security alerts, subscribe to my free CyberGuy Report Newsletter by heading to Cyberguy.com/Newsletter.

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Polymarket defends its decision to allow betting on war as ‘invaluable’

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Polymarket defends its decision to allow betting on war as ‘invaluable’
It might be World War III, but at least I won $20. | Image: Polymarket / The Verge

Polymarket has been allowing people to bet on when the US would strike Iran next. Obviously, now that it’s actually happened and people have died, the prediction betting market is feeling some pressure. The site has been at the center of controversy before, including suspicions of insider trading on the Super Bowl halftime show and the capture of Venezuelan President Nicolás Maduro.

In a statement posted on its site, Polymarket defended its decision to allow betting on the potential start of a war, saying that it was an “invaluable” source of news and answers, before taking shots at traditional media and Elon Musk’s X. The statement reads:

Read the full story at The Verge.

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Google dropped dark web monitoring: Should you care?

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Google dropped dark web monitoring: Should you care?

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Google has officially discontinued its Dark Web Report feature, a free tool that once scanned known dark web breach dumps for personal information tied to a user’s Google account. The service delivered notifications when email addresses and other identifiers appeared in leaked datasets.

According to Google’s support page, the system ceased scanning for new dark web data Jan. 15, 2026, and the reporting function was removed entirely on Feb. 16, 2026, meaning users can no longer access the feature.

The company said the decision reflects a shift toward security tools it believes provide clearer guidance after exposure, rather than standalone scan alerts.

If you previously relied on the free dark web scan as an early warning signal for leaked data, this change removes one of your sources.

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Google officially ended its Dark Web Report tool, removing free breach alerts tied to user accounts. (Kurt “CyberGuy” Knutsson)

So what did users really lose?

Google’s Dark Web Report acted as a basic exposure scanner. It checked whether personal information linked to a Google account had surfaced in known breach collections circulating on the dark web.

When a match is found, users receive a notification identifying which type of data appeared in a leak. Depending on the data breach, that could include an email address, phone number, date of birth or other identifying details commonly harvested during large-scale hacks.

The report did not display stolen credentials or provide access to the leaked database itself. It also did not trace the origin of the compromise beyond referencing the breached service when available.

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After an alert was issued, the next steps were left to the user. Google recommended actions such as changing passwords, enabling stronger authentication methods and reviewing account security settings. With the tool now removed, that automated breach check tied directly to a Google account is no longer available.

What you still have access to

Google directs users to its Security Checkup, a dashboard that scans your account for weak settings and unusual sign-in activity.

Its built-in Password Manager includes Password Checkup, which scans saved credentials against known breach databases and prompts you to change exposed passwords. Google also supports passkeys and two-factor verification to lock down account access.

The Results About You tool lets users search for personal information in Google Search and submit removal requests for certain publicly indexed details.

149 MILLION PASSWORDS EXPOSED IN MASSIVE CREDENTIAL LEAK

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Without the automatic scan, users must now check for leaked data using other security tools. (iStock)

Alerts don’t always mean protection

Once personal information is compromised, it often ends up far beyond the breach itself. Stolen credentials and identity data are regularly trafficked on underground platforms where buyers can search for information tied to real people.

The BidenCash dark web marketplace was taken down by U.S. authorities in June 2025, and the Justice Department confirmed that the platform peddled stolen personal information and credit card data.

These illicit markets operate with a level of organization not unlike legitimate online stores. Search tools and bulk data sets are up for grabs and can be used to target any online account. This makes credential stuffing easier, where attackers test leaked passwords across multiple services in hopes of barreling into your account.

A breach alert tied to a dark web scan points to a leak at one moment in time; it does not follow whether that information has been sold to third parties or used in subsequent fraud attempts. For everyday users, this means that just knowing your data appeared in a leak doesn’t help much.

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Stolen personal information can circulate for years, making ongoing monitoring more important than a one-time alert.  (Kurt “CyberGuy” Knutsson)

Identity monitoring may be a better option

With Google’s scan gone, some people may consider dedicated identity protection services instead. Many of these services offer continuous monitoring of your personally identifiable information and send alerts about changes to your credit reports from all three major U.S. credit bureaus. That can include notifications about new inquiries, newly opened accounts and monthly credit score updates. Some plans also monitor a broader range of personal identifiers, such as driver’s license numbers, passport numbers and email addresses.

Beyond credit monitoring, certain services track linked bank, credit card and investment accounts for unusual activity. They may also monitor public records for changes to addresses or property titles and alert you if your information appears in those filings.

Many providers include identity theft insurance to help cover eligible out-of-pocket recovery costs. Coverage limits vary by plan and provider. Additional features often include spam call and message protection, a password manager, a virtual private network (VPN) and antivirus software.

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No service can prevent every form of identity theft. However, ongoing monitoring and recovery support can make it easier to respond quickly if your information is misused.

See my tips and best picks on Best Identity Theft Protection at Cyberguy.com.

Kurt’s key takeaways

Google’s decision to drop its Dark Web Report may seem small. But it removes a tool many users relied on. For some, those alerts were the first warning that their data appeared in a breach. That automatic scan is now gone. Google still offers Security Checkup, Password Checkup, passkeys and two-step verification. However, none of them actively scan dark web breach dumps for you. Stolen data does not disappear. Criminals copy, sell and reuse it. One alert shows a single moment. Ongoing identity theft monitoring helps you stay aware over time.

Now that Google has dropped its dark web monitoring feature, will you actively check your data exposure or assume someone else is watching it for you? Let us know your thoughts by writing to us at Cyberguy.com

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Xiaomi 17 is a small(ish) phone with a big(ish) battery

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Xiaomi 17 is a small(ish) phone with a big(ish) battery

Xiaomi has just given a global launch to two of its latest flagship phones, the Xiaomi 17 and 17 Ultra, along with a Leica-branded Leitzphone edition of the Ultra. There’s no sign, however, of the 17 Pro, which launched in China with an additional display mounted next to the rear cameras.

The 17 and 17 Ultra will apparently be available soon in the UK, Europe, and select other markets. The 17 — pitched as a rival to the likes of the iPhone 17 and Samsung Galaxy S26 — will cost £899 / €999 (about $1,200), while the larger and more capable Ultra starts from £1,299 / €1,499 ($1,750). The limited-edition Leitzphone will be substantially more expensive at £1,699 / €1,999 ($2,300), though it includes 16GB of RAM and 1TB of storage, along with a few extra accessories.

I like the simple, sleek aesthetic of the phone.
Photo of Xiaomi 17 homescreen on a wooden table outdoors

The 6.3-inch display isn’t tiny, but it does make the phone small by modern standards.
Closeup on Xiaomi 17 rear camera

All three of the phone’s rear cameras are 50-megapixel.

The 17 is an extremely capable small-ish flagship, with a 6.3-inch OLED display, Qualcomm Snapdragon 8 Elite Gen 5, and large 6,330mAh silicon-carbon battery (though sadly smaller than the 7,000mAh version launched in China). I won’t be writing a full review of the 17, but did spend a week using it as my main phone, and found that the battery cruised past the full-day mark, though wasn’t quite enough for two full days of my typical usage. That’s far better battery life than you’d find in similarly sized phones from Apple, Samsung, or Google.

The cameras impress too, with 50-megapixel sensors behind each of the four lenses, selfie included. Pound for pound, you won’t find many better camera systems in any phone this size.

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1/10

I’ve been largely impressed by the Xiaomi 17’s cameras.

The Ultra, unsurprisingly, takes things to another level. It’s much larger, with a 6.9-inch display, and weighs a hefty 218g. Despite that, the 6,000mAh is actually smaller, though I found it delivered pretty similar longevity.

Photo of Xiaomi 17 and 17 Ultra on a table, closeup on the cameras

The 17 Ultra is larger in just about every respect, but strangely has a smaller battery.

The enormous camera is, as ever for Xiaomi’s Ultra phones, the highlight. There are 50-megapixel sensors for each of the main, ultrawide, and selfie cameras, with a large 1-inch-type sensor behind the primary lens. The periscope telephoto is even more impressive: 200-megapixel resolution, a large 1/1.4-inch sensor, and continuous optical zoom from 3.2x to 4.3x, the equivalent of 75-100mm. Xiaomi isn’t the first to pull off a true zoom phone — Sony’s Xperia 1 IV got there first in 2022 — but the telephoto camera here is far more capable than that phone’s, with natural bokeh and impressive performance even in low light.

Photo of Xiaomi 17 Ultra Leitzphone outdoors

This is the Leica-branded Leitzphone version of the 17 Ultra.

The camera capabilities are supported by Xiaomi’s ongoing photography partner Leica, but it’s the pair’s Leitzphone that really emphasizes that. Slightly redesigned from the 17 Ultra Leica Edition that was released in China last December, this includes Leica branding across the hardware and software, a range of Leica filters and shooting styles, and a rotatable rear camera ring that can be used to control the zoom. It’s the first Leica Leitzphone produced by Xiaomi — after a trio of Japan-only Sharp models — and comes with additional branded accessories, including a case with a lens cap and a microfiber cleaning cloth.

Xiaomi has plenty of other announcements alongside the 17 series phones at MWC this year, including a super-slim magnetic power bank, the Pad 8 and Pad 8 Pro tablets, and a smart tag that supports both Google and Apple’s tech-tracking networks.

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Photography by Dominic Preston / The Verge

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