See your account balance and plan information: Dial #BAL# (#225#) and press Send.
Can I call 611 to change my number?
Changing Your T-Mobile Phone Number From your T-Mobile phone, dial 611 or 1-877-746-0909 and follow the instructions. There is a $15 fee to change your number, unless you're on a Pay in Advance plan. Changing your phone number will take some time to complete, although it rarely takes longer than four hours.2020-07-07