T-Mobile hoax accuses users of visiting porn, hacking sites

TL;DR

• Some T-Mobile subscribers have received letters in the mail purporting to be from the carrier and accusing them of browsing “unethical” websites.
• The letters don’t appear to be part of any obvious scam, and seem to just be intended to intimidate their recipients.
• T-Mobile has strongly denied any involvement, and says it’s investigating where they came from.