UDID: Frequently Asked Questions about iPhone UDID Numbers

Did you know that in 2012, Hackers released tons of iPhone UDID’s (Unique Device Identifier) online? We have therefore compiled a list of common questions and answers on iPhone UDID numbers.

What is a UDID number?

iOS devices such as iPhones, iPods touch, and iPads possess a unique device identifier (UDID). This is a 40 -character alphanumeric identifier that is peculiar to each Apple device.

Is it safe to give out my UDID number?

No, it is not safe to give out your UDID number to third-parties you don’t trust. This is a risk to user privacy which is one reason Apple limited the use of UDID numbers.

For example, UDID number can link other kinds of information to that iOS device.

UDIDs are more delicate than web cookies because we cannot delete them. They’re linked to our mobile phones. Hackers and network snoopers can access information such as usernames, device names, and phone numbers of the users.

Using the UDID numbers, app vendors can track subscriber behavior. This means they can limit usage of their services to a single device.

Where Is My UDID Number in My iPhone?

The following steps will guide you in checking your UDID number on your Apple device.

1. Launch iTunes and connect to your iPhone or iPad
2. Under devices, click on your device
3. Click on the Serial Number
4. Click on edit and then copy the number from the iTunes menu.
5. Paste in your email and you should see the UDID in your email box.

Why Do I need to know my UDID number?

UDID is useful to developers so if you need an app developer to make an app for you, you need to know your iOS UDID number. The UDID is required to install alpha and beta iOS applications into your device before the applications get released to the official Apple store.

Also, as mentioned before, some services restrict access by multiple devices using a single account. This will be possible through tying UDID to a respective account.