There is nothing from the phone that you can do to change or block the name that appears on caller id systems other then just fully blocking the number.
You can call T-Mobile support and they will either be able to change the name to the user of the line in their system which should update to caller id systems in 3 days or you can have them set the name to just "Wireless Caller" but there needs to be some information attached to it.
And there are guidelines they need to follow as to what they would allow in that information.
But yeah I would give them a call and just let them know you want to update outgoing caller id information to a different name. Customer care should be able to do that for you. If not I know technical care can.
I just called up T-Mobile support and got this taken care of. They advised 24 hours for the change to go through.
Glad to hear it.
And that it seems quicker then I remember it being before.
There is an easy cure for this problem. Though you are the MAIN (eg. paying) account holder, anyone with a Tmobile phone number can creat an account at:
Once they sign up, your parent's name will appear as the "ID" even though you are the main and paying account holder. It worked for my kids.