Hi on my my plan is my brother my mom and me. I have an iPhone 4S my brother has some flip phone and my mom has a env. My moms phone was available for an upgrade. I tried to get the upgrade to switch over to my line but it wouldn't let me do that. So I just updated my moms phone to the iphone 5. Now how would I get that on my line? Could I just switch numbers and then my mom could go on my 4S and then downgrade back to her env?