12-11-2013 11:30 AM - edited 12-11-2013 1:03 PM
Are your settings like this?
Also see these...
My AT&T Lumia 520, running Amber, is configured just like the screen shot. I can send/receive MMS messages just fine. I bought my Lumia 520 back in October...
12-12-2013 7:04 AM
Also check to see the data connection is ON...
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