Unlocked T Mobile G2 messaging problems

[welder1973]

I have an unlocked T Mobile G2(running on AT&T) and found APN settings on a site and cant remember which one and put it into my phone. The SMS and MMS work.. The problem is when I receive a regular MMS picture it comes in as video. I think one of the APN settings was incorrect or maybe I typed it in wrong.. Either way, can anyone help with this problem so my pictures come in as aAPN regular pic?