What is a UDID
UDID (Unique Device Identifier) is a 40-character long string of letters and numbers that is used to identify individual Apple devices such as iPhones, iPads, and iPods. It is a unique identifier assigned by Apple to each device during the manufacturing process and cannot be changed.
The UDID is used by developers to test their apps on specific devices before submitting them to the App Store. Additionally, some advertisers and marketers also use UDID to track and target ads to specific devices.
However, starting from iOS 5, Apple stopped accepting new apps that access UDID, as privacy concerns grew around the use of such identifiers. In place of UDID, Apple introduced a new method for tracking devices, called Identifier for Advertisers (IDFA), which provides a more privacy-sensitive way of tracking users.
Two ways of getting your UDID
- You can use a service like Get UDID to easily display your UDID on your iPhone or iPad
- Connect your device to your computer using a cable. Open iTunes, Click the button for your iOS device, Click the “Summary” tab. You’ll find this option in the menu on the left after selecting your device. Click the “Serial Number” entry. Right-click the UDID and click “Copy.
We'll need your UDID to enable your device to install am app without having it deployed to the Apple App store. This is great for testing app changes and providing feedback to us.
