[tejaswiy]

Agree. But I've been wondering what exactly do people want with a "Device ID"? I've changed my code to generate a new GUID and save it to NSUserDefaults. Sure, it doesn't persist even across app reinstalls, but so what? I maintain it as a currently active device ID instead of a unique device identifier..

[hboon]

It's often networks providing advertising or analytics services that want to identify devices. Not the app/service itself.