Question

How can I get the unique ID of the user’s device in an iOS app?

Answer 1

use this

    UIDevice *device = [UIDevice currentDevice];
    NSString *uniqueIdentifier = [device uniqueIdentifier];

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Update

Apple has the deprecated unique identifier, so now the following code (from Melvin Sovereign’s comment) is appropriate:

NSString *uniqueIdentifier = [[[UIDevice currentDevice] identifierForVendor] UUIDString];