Can't log in to iTunes store on iPhone?

Ok, so if I go onto iTunes on my iPhone its fine. But my problem is I want to update some of my apps, when I click on 'updates' on the app store I get a message that says 'can't log in to iTunes store'
Anyone know what I need to do?
Any help is gratefully appreciated.
Cheers

Added (1). Hunter: thank you for your answer, I have checked and my email address connected to my iTunes is correct on the settings, but still not working.

Go to settings>store>and under Apple ID put down the correct Apple ID.

Update to 6.1.

Make sure your time and date are correct then try again.

Hope this helps

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