One thing you can do (and should do) is call your phone company and tell them you want to lock your long distance. There is a special term for this, but I cannot remember it but the phone co will know what you are talking about. When you make this request they put a note on your account that prevents any changes on it unless specifically requested by you. This prevents other companies from changing the PIC code attached to your phone. The PIC number is the "dial around" code for a long distance carrier. This allows you to use the carrier of your choice for long distance. If you don't lock it, carriers can actually change it. If locked, only you can have it changed.
