How to un back-up an iPhone?

I've backed up my iPhone on a computer and messed up everything! Please help!

Added (1). I can't log into my apple ID as it says i do not have network even though all my network is fine and considering i have Wi-fi.every time i try to get an app, it says i need to update my billing information and that doesn't work either, says my payment method is wrong, even though it is not, i do no longer have iMessage or FaceTime

If all you did was back it up, nothing on the phone should have changed, all that would happen is that a copy of the stuff on the phone was stored on the computer or on iCloud.

Please update your question to say exactly how everything is now messed up. Have apps and other stuff disappeared from the phone? Has EVERYTHING disappeared from the phone or just some things? Is the phone acting like it's brand new again? Any details you can give will help you get a better answer.

You attach it to your computer, and then select "restore"in iTunes.

http://support.apple.com/.../kb/ht1766

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