Why is my iPhone 4s messed up?

Its stuck in horizontal mode where it only shows the albums and won't go back to vertical and no it's not on screen lock I checked

Perhaps the level inside the iPhone is broken, meaning that it doesn't know whether it's vertical or horizontal.

EDIT:
Go here:
https://expresslane.apple.com/GetproductgroupList.do?PRKEYS=PL133

Hey if you wanna check out info about your iPhone visit www.iphoneadmin.com just enter your imei that easy and no charge

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