As we all know Verizon iPhone 4 is launched and might be there are viewers who want to shift from AT&T to Verizon and fear about how all the information, apps, and data will be transferred from AT&T iPhone to Verizon iPhone.
Follow below listed steps to make data transfer from AT&T to Verizon iPhone 4.
Steps 1: Plug your AT&T iPhone into your computer.
Steps 2: Launch iTunes.
Steps 3: Automatically iTunes will start to sync. If it doesnt start to sync.
Steps 4: Unplug your AT&T iPhone and Plug your new Verizon iPhone 4 into your computer.
Steps 5: Launch iTunes.
Steps 6: iTunes will prompt your to register the new iPhone if it has not been registered yet.
Steps 7: You will be prompted to do one of two things. set up as a new iPhone or restore from a backup.
Steps 8: Select to restore from a backup which was made by you using Steps 3.
Just have a cup of coffee and iTunes will replicate all the settings and data as your old AT&T iPhone.
http://www.unigizmo.com/1450/shift-from-att-to-verizon-how-to-guide-for-data-transfer

Follow below listed steps to make data transfer from AT&T to Verizon iPhone 4.
Steps 1: Plug your AT&T iPhone into your computer.
Steps 2: Launch iTunes.
Steps 3: Automatically iTunes will start to sync. If it doesnt start to sync.
- Select the device name from iTunes (In the navigation bar under DEVICES option at the left side of the iTunes Screen).
- Right Click on the selected device name.
- Click on Sync or Back Up option in the pop up menu (Either one will work fine).
Steps 4: Unplug your AT&T iPhone and Plug your new Verizon iPhone 4 into your computer.
Steps 5: Launch iTunes.
Steps 6: iTunes will prompt your to register the new iPhone if it has not been registered yet.
Steps 7: You will be prompted to do one of two things. set up as a new iPhone or restore from a backup.
Steps 8: Select to restore from a backup which was made by you using Steps 3.
Just have a cup of coffee and iTunes will replicate all the settings and data as your old AT&T iPhone.
http://www.unigizmo.com/1450/shift-from-att-to-verizon-how-to-guide-for-data-transfer