I searched on these forums, and even googled it, but i don't understand what's happening. I have an iphone, same settings, same firmware 3.1.2 not custom, downloaded straight from apple's servers, and with my friend's iphone, i cannot receive mms due to what it says " incorrect message size, or message resolution error." Is there anyone that is having the same problem? I am able to send though.

yes and cant figure out how to fix it- i thought if i increased the message size in APN settings it would work but i dont think so