This story was originally published and last updated .
T-Mobile has confirmed to Android Police it has shut down a data breach operation that may have harvested a small group of customers' phone numbers, number of lines per account, and call diagnostic metrics. Customers who may have been affected were alerted via text message yesterday and told that the event took place in November.
The company tells us that hackers did not have access to any names associated with the account, financial data, credit card information, social security numbers, passwords, PINs or physical or email addresses.
While most of the worrisome stuff has been excepted here, those call diagnostic metrics — customer proprietary network information as defined by the FCC — can and may include call location data such as tower IDs and even granular information from your device.
On the whole, though, it appears that the scale of impact both in terms of severity and range is relatively minimal this time around — there are plenty of two-bit attacks like this one that we don't get to report on — but T-Mobile has made itself out to be a frequent victim as it has been affected by at least one big attack every year. Indeed, there was another hit back in March.
That said, getting around to every possible person who's been affected can be a time-consuming task: one subscriber said yesterday they were just alerted by T-Mobile to a potential compromise that happened 9 months ago.
Scope of breach
Curious why you haven't gotten an alert yet? T-Mobile has provided slightly more detail about just how many users were affected by this breach, giving us a clearer picture of its scope.
The carrier reports that the breach involved a "small number of customers (less than 0.2%)," which may seem quite small until you consider that T-Mobile's got right about 100 million active subscribers in the US. So, if you're not among that 200,000 or so, consider yourself lucky.