How To Get Identifier Number (UDID) of iPhone, iPod or iPad - Apple

The identifier number, also known as the UDID, of an iPhone, iPod, or iPad is a unique number that identifies your device. If you are an Apple developer you will need this number to install any software on your non-jailbroken phone that isn't available in the Apple App Store. 

STEPS 

1

LAUNCH ITUNES. 

2

PLUG IN YOUR IPHONE, IPOD, OR IPAD. 

3

CLICK ON DEVICE NAME IN ITUNES MENU. 

4

CLICK ON "SERIAL NUMBER" IN SUMMARY MENU. 

5

NOTICE THAT THE SERIAL NUMBER WILL CHANGE TO A LONG LETTER AND NUMBER STRING. This is the Identifier / UDID. 

6

PRESS COMMAND+C (MAC) OR CONTROL-C (WINDOWS) TO COPY THE UDID NUMBER FROM ITUNES. Paste into a document for later use. 

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The UDID number can be used in the Apple iPhone developer portal to generate the provisioning Certificates needed to install applications for development or ad-hoc distribution.