These additional accounts did not have any SSNs or driver’s license/ID information compromised. We have since identified an additional 667,000 accounts of former T- Mobile customers that were accessed with customer names, phone numbers, addresses and dates of birth compromised.

We also previously reported that data files with information from about 40 million former or prospective T-Mobile customers, including first and last names, date of birth, SSN, and driver’s license/ID information, were compromised.

Additionally, we have since identified another 5.3 million current postpaid customer accounts that had one or more associated customer names, addresses, date of births, phone numbers, IMEIs and IMSIs illegally accessed. We have now also determined that phone numbers, as well as IMEI and IMSI information, the typical identifier numbers associated with a mobile phone, were also compromised.

We previously reported information from approximately 7.8 million current T-Mobile postpaid customer accounts that included first and last names, date of birth, SSN, and driver’s license/ID information was compromised.

Our investigation is ongoing and will continue for some time, but at this point, we are confident that we have closed off the access and egress points the bad actor used in the attack.

We have continued to work around the clock on the forensic analysis and investigation into the cyberattack against T-Mobile systems while also taking a number of proactive steps to protect customers and others whose information may have been exposed. Please see a blog from our CEO Mike Sievert.

Update sim card hack