MMS uses data, it doesn't matter if you don't have a 3g connection, it will use 2g. Also, you cannot send mms over wifi. If your phone has the correct settings and data is turned on then the issue will be with your account. You need to ask cs to remove MMS from your account and reprovision it, Basically this means deleting and re applying, but it is the important step to getting MMS working.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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