Hackers have found their way again into T-Mobile’s ($TMUS@US) systems; the 4th reported breach of its data since early 2020. This time, the haul included sensitive personal information associated with about 48 million people, most of whom were former or prospective customers of the self-styled “un-carrier.” According to the company, the stolen data included names, birth dates, Social Security numbers, and driver’s license information. At least 850,000 customers with prepaid accounts had their names, phone numbers, and account PINs exposed. Hackers started offering the data for sale last weekend. Cell phone users attach financial and other accounts to their phones, so PIN theft allows hackers to break into the accounts that you’ve tied to your phone number.