What is the UDID?
Each iPhone or iPod Touch has a Unique Device Identifier (UDID), which is a sequence of 40 letters and numbers that is specific to your device. It’s like a serial number but much harder to guess. It will look something like this:2b6f0cc904d137be2e1730235f5664094b831186.
Why do we need the UDID? （为什么需要UDID？）
Your iPhone can only install programs that are approved by Apple. Applications in the App Store have been approved by Apple for general distribution, but beta customers get to try the app before it’s in the store. We register your UDID with Apple so they can approve our application especially for your iPhone.
我们发送的IPA安装包，需要有UDID才能正常授权并运行测试。
How do I get my UDID? （怎样获得UDID？）
- Free install and run “UDID Sender” . It will create an email with your UDID. Send it to ninesky.en@gmail.com
- 免费安装并运行UDID Sender，这个APP将您的UDID通过Email发送给开发者，注意收件邮箱填ninesky.en@gmail.com
- UDID Sender URL ： http://itunes.apple.com/app/id=306603975
Or:
或者iTunes上，点击短的序列号，就会出现长的UDID
You can copy/paste your UDID from iTunes or email it directly from your device by using a free app from the App Store.
Copy/Paste from iTunes
- Launch iTunes and connect your iPhone.
- In the right pane, locate the information about your iPhone, including its name, capacity, software version, serial number, and phone number.
- Reveal the Identifier by clicking on Serial Number:.
- Copy the Identifier to your clipboard by choosing Edit → Copy.
- Paste the Identifier into an email to ninesky.en@gmail.com (You should be able to paste into your mail program or web browser by selecting Edit → Paste).
This article from here – http://www.innerfence.com/howto/find-iphone-unique-device-identifier-udid, and modify some information.
