Customize "want contacts" prompt?

Question

Is there a way to customize the prompt that appears when my app tries to access the address book?

I want to add an explanation of what data I use, and why I need it.

Answer 1

In iOS 6, this has been added to the Info.plist file. You want to set the key NSContactsUsageDescription (remember that you can localize this in InfoPlist.strings). The descriptive name for this is "Privacy - Contacts Usage Description."

I'm not aware of a way to set this in iOS 5.