How to Setup Straight Talk Wireless Data and MMS for your iPhone running iOS 6

7. Remove your StraightTalk AT&T SIM from your iPhone

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8.  Insert the T-Mobile SIM


9. Tap  Settings->General->Cellular->Cellular Data Network

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10. if you don’t see Cellular Data Network, restart your iPhone with the T-Mobile SIM in your iPhone.  Repeat #8

11.  Remove the T-Mobile SIM card. Insert your AT&T SIM card.



12. The Cellular option will be grayed out. Wait until it is available. Tap  Settings->General->Cellular->Cellular Data Network

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