What Is a UDID? How to Find Your iPhone UDID (No Computer)
Before installing a signed multi-open app you'll often be asked for your iPhone's UDID. Here's what it is, in plain terms, and how to get it right on your phone — no computer needed.
What is a UDID?
UDID (Unique Device Identifier) is a code unique to each iPhone or iPad — like your device's ID number. Signed installs use it to authorise the app for your specific device so it opens correctly.
How to find your iPhone UDID (no computer)
The easiest way is right on your phone: open the install page, tap once, and it walks you through installing a small profile and shows your UDID to copy — no computer, no iTunes.
📷 [screenshot] Getting and copying the UDID on your phone
Is sharing my UDID safe?
A UDID is just a device identifier used for signing. It does not contain your passwords or chat data. A legitimate signing service only uses it to sign apps for your device.
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