I ve had an IPhone for 2 yrs and going to upgrade to the newest phone next week. My wife has a non smart phone and has only had it for 3 months. She wants to upgrade to the new IPhone. What would be the cheapest way of doing this? Will she be charged a cancelation fee to move to a contacted IPhone? Or will they allow you to upgrade to the smartphone due to the higher billing? Would it be cheaper to add a line to my account and only have one bill or for her to have her own bill?