After having ugraded my iphone 4s at ios 7 i'm not able to instaIla any apps

After having ugraded my iphone 4s at ios 7 i'm not able to install any app. Is it a known problem? Is there a solution? It isn't neither a trouble with the account because on my ipad works, nor a trouble of memory, i tried to free some space.

Thanks for the prompt response,
I think iTunes store is not available in Nigeria right now !.
http://www.apple.com/ng/itunes/

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