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T-Mobile customers' address, number, and other info allegedly up for sale; company denies claim [UPDATED]

Hackers allegedly stole data on 64 million T-Mobile customers this month.

By Anam Hamid

Updated: Jun 16, 2025, 9:43 AM

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T-Mobile Wireless service

Update from June 16, 2025:

T-Mobile reached out to us and reaffirmed that reports about a breach are inaccurate.

For background - based on its structure, naming, and inconsistencies, the dataset appears to be a synthetically generated repackaging of old and/or unrelated data, a tactic used by bad actors to scam buyers.

—T-Mobile spokesperson, June 2025

The original story from June 13, 2025 follows below:

Cybercriminals claim to have accessed data on T-Mobile customers, though the company has provided assurances that this is not the case.

Cybernewsreports that hackers stole the data of 64 million customers. They allegedly managed to get their hands on highly sensitive details such as full name, date of birth, Tax ID, house address, email address, IP address, and phone number.

T-MobiletoldThe Mobile Report that it has examined the data sample posted by hackers online and has determined that the information is not related to the company or its customers.

Any reports of a T-Mobile data breach are inaccurate. We have reviewed the sample data provided and can confirm the data does not relate to T-Mobile or our customers.

—T-Mobile, June 2025

If that's indeed the case, customers can rest easy. That said, data breaches often go unnoticed for a long time and it's possible that the information was stolen through a third-party partner.

The records are fairly recent and were likely stolen earlier this month.

According to Cybernews' analysis, at least some of the emails in the data sample were included in previous breaches, so someone may be trying to profit off of a previous attack. That said, the leak also contains data points that hadn't appeared before, such as phone numbers. Some of the sample data wasn't found on Have I Been Pwned, a website that maintains a database on past breaches. This again implies that the information wasn't pulled from a past leak.

The hacker's post on the forum. | Image Credit - Cybernews

The sample data was posted on a forum that's the go-to marketplace for sellers attempting to sell such information. The poster is someone who has shared legitimate data in the past.

Given that T-Mobile says that it reviewed the data and found no links to itself, customers don't necessarily need to worry. However, the fact that the information appears to be legitimate and fresh leaves room for concern.

T-Mobile settlement checks for the 2021 data breach only recently started going out. Another breach on the heels of that would reflect poorly on the company and its claim that it dedicated resources to improving system defenses.

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Anam Hamid is a computer scientist turned tech journalist who has a keen interest in the tech world, with a particular focus on smartphones and tablets. She has previously written for Android Headlines and has also been a ghostwriter for several tech and car publications. Anam is not a tech hoarder and believes in using her gadgets for as long as possible. She is concerned about smartphone addiction and its impact on future generations, but she also appreciates the convenience that phones have brought into our lives. Anam is excited about technological advancements like folding screens and under-display sensors, and she often wonders about the future of technology. She values the overall experience of a device more than its individual specs and admires companies that deliver durable, high-quality products. In her free time, Anam enjoys reading, scrolling through Reddit and Instagram, and occasionally refreshing her programming skills through tutorials.

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