My daughter is moving to England for 3 years. It is cheaper for her to purchase another phone with a UK SIM card than adding a British SIM for the 3 years. We would like to disable her line on our plan for the time she is over there and then reactivate it when she returns. She is worried about loosing her current phone number during those three years because all her friends, clients, and contacts in the U.S only have that number and when she comes back she wants to use it again. Can we deactivate a line yet reserve the number?