How to auto populate phone number from iphone? [duplicate]

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Possible Duplicate:

Programmatically get own phone number in iPhone OS

I am developing an iOS 4.1 application that need to get the phone number of the user. I have tried the blow code to get the phone number. But it is not working.

NSString *num = [[NSUserDefaults standardUserDefaults] stringForKey:@"SBFormattedPhoneNumber"];

is there any way to get the phone number in iOS 4.1 ?

Thanks, Shinto

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In short there is no approved way to do this.

This is a duplicate question see Programmatically get own phone number in iOS for more info.