I want to know that if i want to download facebook on my iphone 4 or any other apps then it ask me put my card details for payment. why is that. if they are free then why do i need to give my card details?please help me anyone.

I want to know that if i want to download facebook on my iphone 4 or any other apps then it ask me put my card details for payment. why is that. if they are free then why do i need to give my card details?please help me anyone.

Just select no credit card as outlined here:
http://support.apple.com/kb/ht2534

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