Originally Posted by tchao
not sure if this is related to blackberry. any idea? thanks
Did you port your number from AT&T or some other carrier to T-Mobile? If so, you may need to have the number rebroadcast by the folks at T-Mobile. Basically that tells other carriers where your number is now so calls can be routed correctly.
If you didn't port your number from another carrier to T-Mobile or you had the rebroadcast done already then a trouble ticket needs to be done so the T-Mobile engineers can get involved.
Either way, you need to call T-Mobile. Make sure to gather three examples of when someone tried to call you and it didn't work. Be specific with date/time, the number that was trying to call you, and any error messages or recordings the other party heard/saw. The more information you gather now the faster the issue will be resolved for you.