I currently have 3 IPhone's on my plan a 5s, a 5 and a 4s. The 5s and 5 still have over a year until they are eligible for an upgrade however the 4s is eligible for an upgrade at anytime. Can I use the upgrade for the IPhone 6+ on the main and move the Iphone 5 user to the 5s and the 4s user to the 5?
