Hi, I'm having the same problem. I was able 2 send my g.f. text messages @ any given time of the day. The past 2-3 weeks I cant send them & I get that same message. It happens to e in the morning n cant send her no texts till either se snds e 1 or calls me.. she ony lives next city over...called t-mobile but just the run-around
Were you able to get this working? If not, try the below steps to highlight the T-Mobile profile:
To change the service center number, follow these steps:
From the Home screen, press the Menu button.
Scroll to and select Messages.
Press the Options button (left convenience key)
Scroll to and select Settings.
Scroll to and select Text message.
Scroll to and select Profile Settings.
Highlight T-Mobile and press the Options button (left convenience key).
Scroll to and select Edit.
Scroll to and edit the SMSC to +12063130004
Press the OK button (left convenience key).
Verify that T-Mobile is selected, if not use the center select key to activate.
Thanks for posting!