Let’s say you have been invited to be a beta tester for a new iPhone application and the developer asks you for your UDID.
You have no idea what UDID is, and if you are smart you are not going to ask the developer about it. (If you do, expect to get kicked out of the beta testing program immediately).
Here’s how you get your UDID:
Note: UDID stands for Unique Device Identifier
1. Connect your iPhone to iTunes and click on your iPhone under devices
2. In the device information screen you can see the following: Name, Capacity, Software Version, Serial Number, Phone Number.
Click on Serial Number, and Identifier will show up.
Try clicking on on other parameter names for things like: IMEI, Build Version, ICCID.
3. OK, you are ready to copy your Identifier (UDID).
Left Mouse Click on the number and hold it, press CTRL-C on your keyboard, and you are done.