07-06-2012 08:55:07 PM - edited 07-06-2012 09:05:00 PM
Check Data Enabled even if you don't have data. This wil enable MMS but not the web(enabled by data plan). MMS data is not counted as data even though it uses data - it is accounted as messaging.
07-11-2012 04:20:32 PM
If you are using other phones, you may not have the data enable option.
You may want to call AT&T customer service.