First, I have an old ATT sim card from 2002, it's literally a first generation card. So what I did was buy an unlocked treo 750 and for some reason I can enable all of my functions with exception for sending MMS. I've tried pulling the card for 5 minutes, I've updated the Windows Mobile, I've tried resetting it and nothing works. It's odd because I can receive MMS, I just can't send them.

I receive tthe following error when I try to send:

Message could not be sent. A networking error (0x1501) has occured. This could be caused by a voice call, a wired ActiveSync connection, or some other network problem. Please try again.

I'm guessing its a connection problem. Can someone help me with the connection settings so my new phone will be fully functional? PLEASE!!!!