Read UDID from Iphone with javascript on mobile safari

Question

How can I Read UDID from Iphone with javascript on mobile safari?

Answer 1

Update 2:

Since the site below is dead already, this discussion thread in apple.com's forum has the diagnosis and source code on how did that site retrieve the UDID thru mobileconfig.

https://discussions.apple.com/thread/3089948?start=0&tstart=0

---

Update: the site mentioned in this answer is no longer on-line; it's now just a placeholder full of ads. Leaving original message below for reference.

---

Open http://whatismyudid.com/ in your iOS device

it is possible through mobileconfig (Over-the-Air Profile Delivery and Configuration)

http://whatismyudid.com/device/start <- download their mobileconfig and take a look

Answer 2

It's not possible, and it never will be, unless the user explicitly installs policy configurations.