I'm using these on my T-Mobile G Flex and both Internet and MMS work on AT&T Straight Talk. Name of APN can be anything you want.
MMS PROXY: mms3.tracfone.com
MMS PORT: 80
The issue lies in that AT&T has locked the ability to edit the APN Type field. Where you can normal type in: internet,mms,supl,hipri to get your MMS to work they have disabled the option. Those apps will not work. You need to follow the above mentioned comment and edit the system files with the correct settings.
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