Hi all, I have been having problems with MMS on my iPhone 4. I just upgraded the software to 4.0.1 so I don't know if that has anything to do with it. I cannot send or receive picture messages. I had a similar problem when I first got the phone but I solved it by switching "Cellular Data" ON (did not know b/c it's my first iPhone). Anyway, has anyone else had this problem and know how to fix it?