easiest way to uniquely identify a user of an iphone app

Posted by Henry on Stack Overflow See other posts from Stack Overflow or by Henry
Published on 2010-05-26T23:27:37Z Indexed on 2010/05/26 23:31 UTC
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What's the easiest way to uniquely identify a user of an iphone app? I've seen some app only asks for phone number to 'register', isn't that unsafe or is there something I missed?

Thanks.

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