How to Transfer Data From an Old T-Mobile iPhone to a New AT&T iPhone
When you purchase a new AT&T iPhone, you may want to transfer your information from your old T-Mobile iPhone. Apple designed the iPhone to sync with the iTunes application on your computer, and through this process, you can back up the data on your old T-Mobile iPhone and transfer it to your new AT&T iPhone.
Instructions
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Double-click the iTunes icon on your computer to open iTunes.
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2
Connect the iPhone data cable to a USB port on your computer.
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3
Connect the other end of the iPhone data cable to the port located at the bottom of your old T-Mobile iPhone.
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Select your iPhone from the "Devices" section on the left side of the iTunes window.
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Click the "Backup" button to create a backup of the data on your old iPhone. Click "Continue" to initiate the backup process. iTunes will prompt you when the backup is complete.
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Remove the data cable from the bottom of your old T-Mobile iPhone and attach it to the port located at the bottom of your new AT&T iPhone.
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Select your iPhone from the "Devices" list on the left side of the iTunes window.
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Click the "Restore" button located at the bottom of the iTunes window.
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Select the iPhone backup you created from your old T-Mobile iPhone.
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Click the "Continue" button to transfer the data to your new AT&T iPhone. Your iTunes program will prompt you when the restore completes.
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