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have you set the right APN settings? settings>more >mobile networks> acess point names
MMS usually have different apn compared to data
Hi Kazza1,
Welcome to the community,
Try re downloading the settings.
Menu > Settings > More > Internet Settings > Accept disclaimer > Choose network carrier
Once they have downloaded try send an MMS message, make sure you have good 3G reception as well 1 to 2 bars is generally not enough to send an MMS.