How to Find Your UDID

Turn on the iPhone by holding down the power button on the top right of the device until the screen turns on.
Connect the iPhone USB cable to the iPhone dock connector on the bottom of the device.
Plug the USB cable into a PC or Mac.
Open iTunes on the PC or Mac.
Select the iPhone in the devices list in iTunes.
Click on the “Summary” tab to display summary information about your iPhone.
Click on the label that says “Serial Number” to the right of the picture of the iPhone, which will change to “Identifier” and show you your iPhone's UDID, which is the 40-character, alphanumeric string of characters.
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