I also have T-Mobile. I got a text message from this number saying" your credit union debit card has a pending alert. Call now toll free: 1-404-891-1102 and follow instructions to resolve this alert." I do have a debit card with the credit number. When I call I got a computerized message. The message identified itself as as customer service. No company name. When told no human interaction was necessary I quickly hung up also believe it is a scam.