this may not be a comcast issue at all
please see this link
you may need too cal T-mobile your self tell them your porting you phone number over make sure you have you have you port out pin number other wise T-mobile may not allow the port over too happen
Jaghoop, you can also send me a private message so I can check on your ticket. Please send me a private message with your full name and phone number tied to your residential services for help.