Having spent a lot of time sorting out my mms problems where all the obvious faults made no difference I found the final solution in a strange place. Yes the apn was wrong and needed replacing but it still did not work. However, the problem was with turning mobile web on and off. If you go onto connections then normally mobile web is turned on and off in data usage. However that is not all. My culprit was found under sim manager. I found that as a dual sim phone that it was necessary to turn mobile web on here as well. The default is off so selecting an active sim was necessay for mms to work, and I suspect that it may possibly be the source of problems with other usage of mobile web as well.
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