We’ve been hearing a lot just recently about UDID registration and activation. For those who are unaware, a UDID is a Unique Device Identifier that is specific to each separate iOS device. It is very similar to a serial number but is much harder for anyone to guess, being made up of a series of 40 number and letters. While it can be used to identify your device, in theory it cannot be used to identify the owner of that specific device. However, to err on the safe side of caution its best not to give anyone your UDID, unless you are registering for an Apple developer account.
The UDID is needed if you are going to be downloading beta software via the iOS developer portal or test out iOS apps that are not yet in the store. You can find your UDID number by tapping on the serial number of your device listed in iTunes, however, there is a way to do it without having to open iTunes, by using a free app called Ad Hoc Helper, which you can download from the App Store.
Ad Hoc Helper is used to send your UDID number to developers so that they can include you in their Ad Hoc Distribution list. This enables them to create a version of their app that you can run on your device outside of normal channels.
Download and Installation :
Once you have downloaded and installed Ad Hoc Helper, all you need to do is tap on the Home screen icon to run it and you Mail app will open with an email containing your UDID number, along with other system information such as device model and system vision. All you need to do is type in the address of the relevant developer, tap to send and away it will go.
Other Methods to Find UDID :