Internet APN info for Access Point:
Access Point Name - straight talk
Username - blank
Password - blank
Proxy Address - mms3.tracfone.com
Proxy Port - 80
Network Type - IPv4
Authentication Type - none
MMS APN info for Access Point:
MMS Access Point name - tfdata
Username - none
Password - none
Proxy Address - 66.209.11.33
Proxy Port - 80
MMSC Address -
http://mms-tf.net
Network Type - IPv4
Authentication Type - none
These settings work for me on everything with a Straight Talk ATT SIM. Make sure you go into the "Cellular" settings in the "Settings" menu, and clear out all the entries for APNs there, then reboot for good measure. If that doesn't work, I don't know to to help you further. Good luck.