5.8 YOUR MOBILE PHONE IS RESTRICTED TO USE ON OUR NETWORK IN THE UNITED KINGDOM. IF YOU TERMINATE YOUR AGREEMENT WITH US, OR DO NOT REMAIN ON ONE OF OUR DEDICATED TARIFFS FOR IPHONE, ONLY THE IPOD FUNCTION ON YOUR MOBILE PHONE WILL WORK. IF YOU ATTEMPT TO UNLOCK YOUR MOBILE PHONE AND USE ON ANOTHER NETWORK, IT MAY BECOME PERMANENTLY UNUSABLE.