they do not want att customers and will provide as many as possible a bad experience. i know your wife works. any change could cause hers to quit as well and their tech support is no help.

there was a new apn put on their website you may want to try that one. look on the straighttalksim.com site under support. mms is not working if you are able to get internet working for many people. others are having better luck with net10 but still some mms issues. bunches have moved to gophone because of written rules, more data and lte.

good luck

 

Well I recently switched to the One X and I used the same settings I used in my Nokia Lumia 900 and it works fine:

apn: att.mvno
proxy: (blank)
port: (blank)
username: (blank)
password: (blank)
server: (blank)
mmsc: http://mmsc.cingular.com
mms proxy: 66.209.11.33
mms port: 80

Don't bother anything else. And, obviously the parts that say "(blank)" leave blank. lol. This should work. They are the only settings that had everything including the windows features working flawlessly on my Lumia and they work perfectly with my One X as well. This is late, but maybe it'll help someone else.

 

Btw, those mms settings I posted should give you mms without a problem.