T-Mobile just can’t seem to catch a break recently. Fresh off customer irritation at locked phones and rumors its CEO has a wobbly chair, now a hacking group is claiming to have stolen the details of 64 million of T-Mobile’s customers.
If you’re a T-Mobile customer, then you have to be worried. Except, T-Mobile is denying that the data has anything to do with T-Mobile or its customers at all.
Hackers claim to have stolen T-Mobile data and T-Mobile disagrees
‘Hack’ could be made up of previously stolen data
The alleged hack was announced on a popular forum for these sorts of data leaks, and the attackers have claimed the 64 million lines of information are up-to-date as of June 1, 2025, marking this as a potentially very fresh hack. Cybernews has claimed to have seen a portion of the leaked document, and has confirmed the massive hack contains an awful lot of sensitive information. According to Cybernews, the following was included:
- Full names
- Dates of birth
- Tax IDs
- Full addresses
- Phone numbers
- Email addresses
- Device IDs
- Cookie IDs
- IP addresses
It goes without saying that data like this is gold dust for malicious actors, who can use information like IP addresses to fine-tune spearphishing attempts, or can simply use identifiers like full names, dates of birth, and tax IDs to commit financial fraud. The potential harm that can be wrought with a hack like this is massive, and normally, companies would be on panic stations the moment word hit the mainstream.
Only, T-Mobile doesn’t seem too worried. Speaking to The Mobile Report, T-Mobile said:
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.
That’s a pretty strong statement, and would put T-Mobile in the clear. However, it may not be as cut and dry as that. Cybernews discovered some of the data in this alleged hack appeared in previous T-Mobile hacks — but on the other end of the scale, The Mobile Report has noted popular hack-monitoring website Have I Been Pwned has not updated its website to include the new hack. That could indicate there’s no new data here, and all the information contained in this hack was found in previous attacks.
Where does that leave potentially compromised T-Mobile customers? Unfortunately, it seems to be a waiting game. It’s possible this claim is simply fake, and is comprised entirely of previously stolen data, which means the cat was already out of the bag in any case. If another data breach has occurred on T-Mobile’s watch, don’t expect settlements for the damage to come any time soon. Checks for the 2021 hacks only arrived in April of this year, meaning it could be some time before victims see any recompense for the attack.
For the moment, it’s unclear whether this hack is genuine or not, but we’re sure we’ll find out more from this as more people get chance to check out the details.
