toby gray, put your iPhone in DFU mode and Restore with iTunes:
Connect your iPhone to your computer
Turn your iPod off
For 10 seconds, hold both the Home and Power buttons
While still holding the home button down, release the power button only Continue to hold the home button down for an additional 10 seconds. After the dialog box explaining that the iPhone was found in recovery mode has been closed, restore your iPhone. Bad part with this is that you are going to erase the information that has been collecting on your phone since the last backup. Hope this helps, good luck.
Do you want to remove SIM lock from your Phone? If so, use unlock code to enable your phone. Get unlock code from any of the online service providers like Mobile-unlocker.com to unlock your phone. Here, you need to specify your Mobile manufacturer,Mo