When I got my first phone I had picture messaging. Ever since I got my 2nd phone, which was the enV2 and every phone after that I got a message that said "Service not activated on Network" every time I tried to send a picture message. It is still happening on my 4th different phone. I tried *228 and did nothing.
Current phone: Samsung Continuum
It's important to be able to send picture messages, and I know I can help you. From what you describe, it seems as if your picture messaging is not provisioned correctly, or set up correctly, in our network.
Feel free to send me a private message with your name and mobile number. I will be happy to assist you further.