Some of us still have the T-Mobile Legacy Prepaid plan. Essentially once you reached their Gold status (after charging $100), you can put $1 + taxes a year to keep the number active. Calls/texts are $.10 each / each minute.

I rarely use this number. Somehow my account has been seeing these $0.10 charges deducted until the balance is exhausted. Customer Service said it is for outgoing texts but I don't even have the phone connected to their network (and Wifi Calling is disabled). After they disabled my text feature and I put more money in, the money disappeared again.

So, if you have this type of account, keep an eye on it. I am trying to get to the bottom with them on this but they have been pretty arrogant with past problems. Last time, my prepaid balance completely disappeared (probably due to their system conversion) and they blamed me for missing the charge deadline until I produced a screenshot showing they screwed up.

FCC might be next...