Iphone 4s internet connection not working despite having 3g when away from wifi

It works fine with wifi but when I leave the house and go out and about I can no longer connect to the internet despite having a 3g connection everywhere I go. I'm supposed to have internet connection on my contract.
My dad says its something to do with the APN but neither of us have any idea how to change it?
Please help

first try a reset, hold down the home/power button until you see the apple logo and then release, then wait for the phone to boot back up, then try the going on safari.
if that doesn't work then give your phone carrier a call and see if they can resolve the issue.

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