Why my iphone 5 asking to login every time?

I got a new i phone 5 and i create a apple id without creditcard,
when i download any app from app store it asking to login after that i download the apps.

but app store asking to login every time for each app downloads!

Everyone has to log in every time they download an app or update an app. But if you download an app you should be able to download apps and updates without putting in a password for ten minutes. Apple does this so that people can't download things on to your i device without permission, and as far as I know their is no way around this.

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