I got the iphone 4 the day it was released and gave my dad my old 3g (running 4.0 if that matters) and he didn't want to pay for the data plan so I turned off the cellular data under the network section of settings. This way he can still send and recieve calls and texts and even use the internet when in wifi areas, but for some reason mms isn't working. I'm not super good with technology, I just like to think I am, haha. Did I do something wrong or can you simply not get mms on without paying for the iphone data plan? Other helpful info: We're on a family plan that has unlimited texting (picture and video messaging included). And the mms option under settings is enabled. Any help is GREATLY appreciated.