Every iPhone, iPod touch and iPad has a unique identifier number associated with it, known as a UDID (Unique Device ID). Your UDID is a 40-digit sequence of letters and numbers that looks like this: 0e93ff56a22a9cf0c7290cff08ab8752181eb78b. It’s common for developers to ask for your UDID as they require it to give you beta copies of iOS apps.

Finding your UDID using iTunes

  • Open iTunes (the Mac or PC app, not iTunes on your iPhone).
  • Plug in your iPhone, iPod touch or iPad.
  • Click its name under the devices list.
  • Ensure you’re on the Summary tab.
  • Click on the text that says Serial Number. It should change to say Identifier (UDID).
  • Select Copy from the Edit menu.
  • Your UDID is now in the clipboard, so you can paste it into an email or message.