I currently have an iphone 7+, My wife has an iphone 6s. I ordered an XS maxx on my wife's line (because she was eligible for an upgrade). Verizon shipped me the XS maxx and a new sim card, they should be here tomorrow. My plan is to make the new XS maxx MY new phone. Then I will hand my 7+ down to my wife. My question is, do I need to bring the phones into a Verizon store to get everything transferred properly? Can I just move my sim card into the new XS maxx and activate that on my line? Then use the new sim card in my old 7+ to activate it on my wifes line? or what is the procedure that will work for getting both phones activated on the proper line?