unable to download MMS sent by iPhone to non-iPhone

[crackedandblack]

I've sent a few MMS (in the UK on o2) and a few mates can't download them - they both (i think) have Sony Ericcson phones? Any help?

 

[JediMeister]

Here is an article regarding troubleshooting the iPhone's MMS capabilities, but some of the steps are likely applicable to third party phones as well: http://support.apple.com/kb/TS2755