iPhone 3gs mms

I'm assuming you are on Pay As You Go. If so, go to:

Settings > General > Network > Cellular Data Network >

And change the addresses 'idata.02.co.uk' to 'payandgo.02.co.uk'.

Obviously do it for Cellular data and MMS - Visual Voicemail isn't available on PAYG.
 
O2 annoyed me with this as they sent me a text message telling me to update my iPhone via iTunes and if you do it messes all your carrier settings up.
 
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