My parents got divorced and as such me, my brother and mom are switching off the family ATT plan and going to verizon with our aunt/uncle who are currently on a 2 person plan there. Us three (me, brother, mom) are all waiting for the iPhone X. On pre-order day, since we are switching lines from ATT to Verizon, do I just need to get the password from my aunt/uncle's verizon account and use that if i want to add our lines and pre-order the iphone x through that account? We want to do everything through verizon (dont want to do upgrade program through apple because dont want apple care). Is it as easy as how I just mentioned, or do i have to do additional stuff because we are adding 3 lines in addition to doing a pre-order?