It took me ages to find settings which worked with swirly MMS and Orange UK and after a lot of searching, i found them and can confirm they work for sending and receiving. I thought i'd post them here since i've seen a few ppl ask for them over the past with no replies.
Hi Dayloon
Many thanx for the Orange iPhone MMS codes. I have entered them all and now have the option to MMS on photos and the little camera appears next to the keyboard when composing messages. The only problem I'm having is that it fails when it trys to send any pictures in a text. Do I need to do anything else that you are aware of? Under the codes there is a line called MMS UA Prof URL. Does anything go in there?