I was recently messing around with my phone and accidently ended up switching my NAM on my intensity II from NAM1 to NAM2, then back to NAM1 again. After this, I have been unable to send or receieve picture messages, and get the error message "network authentification failed." I believe it's due to me messing with the NAM..I have never had problems before. Please help me fix this problem!!!
Have you tried a Reboot, take the battery out and them put it back in and see if that helps, if not call customer service I'm sure they can help 1-800-922-0202
Sounds like you will have to call *611 and go through the manual programming process. You might also try dialing *228 option 1 before going to customer service.
Hope that helps!:)
As is first suggested, take the phone to the store and have them restore it for you. But if you are adventurous, there are instructions to do it yourself. Use caution.