Iphone 4 won't download new apps?

I have an iphone 4 with ios 7 and it keeps on saying "unable to connect to itunes store, try again" whenever I try downloading an app. I know this is not because of ios 7 because it wasn't working even when I did have ios 6. I know my password is right because it works on other things. I have tried changing my password too but that does nothing. A little help please on how to solve this problem?

There was an ios 7.0.2 update or something silly like that a while back…

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