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Once you have a development certificate installed, the next step is to specify which devices are to be used to test the iOS apps you are developing. This is achieved by entering the Unique Device identifier (UDID) for each device into the Provisioning Portal. Note that Apple restricts developers to 100 devices per year.
A new device may be added to the list of support supported test devices either from within the Xcode Organizer window, or by logging into the iOS Developer Portal and manually adding the device. To add a device to the portal from within Organizer, simply connect the device, open the Organizer window in Xcode using the Organizer toolbar button, select the attached device from the left hand panel and click on the Add to Portal button. The Organizer will prompt for the developer portal login and password and then connect and enable the device for testing.
Manually adding a device, on the other hand, requires the use of the iPhone’s UDID. This may be obtained either via Xcode or iTunes. Begin by connecting the device to your computer using the docking connector. Once Xcode has launched the Organizer screen will appear displaying summary information about the device (or may be opened by selecting Organizer button in the Xcode toolbar). The UDID is listed next to the Identifier label as illustrated in the following figure:
