Each iOS device has a UDID, or a Unique Device Identifier – a sequence of 40 characters that are unique to each individual device.
Think of a UDID as your phone’s social security number: It’s used by developers to connect particular devices to a specific iOS Developer Account, allowing particular individuals to access and test exclusive content.
Developers typically perform a closed beta before a major release to test the functionality iOS apps on different devices. UDID’s allow devs to assess how their apps perform on particular devices in a way that’s fast, painless and secure. Before starting a beta of your own, you’ll first need to create an Apple Developer’s Account: Click here for a quick how-to!
How to Find Your UDID with Mac
- Connect your iPhone to Mac.
- Go to About This Mac.
- Click on System Report and by USB.
- Under the USB 3.0 Bus, you’ll see your iPhone between all the other USB devices connected to your Mac.
- Select your iPhone from the bottom part of the window, copy the Serial Number (you may need to add a dash (-) after the eighth digit in the serial number).
![How to find About this mac](https://messapps.com/wp-content/uploads/2016/08/About-this-mac.png)
How to find your UDID with Your iPhone
You can get it here: https://get.udid.io/.
- Click on “Install”
- Enter your passcode
- Click on “Install”
- Tap to find UDID
- Repeat again points 1-3
- You will get your UDID
![Install screenshot](https://messapps.com/wp-content/uploads/2016/08/Install.png)
![Enter Passcode screenshot](https://messapps.com/wp-content/uploads/2016/08/passcode.png)
![Install again screenshot](https://messapps.com/wp-content/uploads/2016/08/Install-again.png)
![UDID screenshot](https://messapps.com/wp-content/uploads/2016/08/udid.png)
How to find your UDID
- Open up the latest version of iTunes and connect your iOS device to your computer.
- Select your iOS device by clicking the device’s image located at the upper-left corner of iTunes’s UI.
- On the next screen, a window should appear listing your phone’s Capacity, Phone Number, and Serial Number.
- By clicking on Serial Number once, the prompt should change to display your UDID.
![Select your iOS device](https://messapps.com/wp-content/uploads/2016/08/1-300x33.jpg)
![Capacity, Phone and Serial Number](https://messapps.com/wp-content/uploads/2016/08/2-300x97.jpg)
Since your UDID will never change (on its own), copy and paste it elsewhere for quick and easy access later in the future!