I plan on upgrading my current iphone to a 6s. I think I'm going to buy a new iphone when a new one comes out each year. Question is, what is a better, more cost effective way to go. Paying roughly $40/month ($480/year) through the upgrade program (assuming I get 128gb iphone), or buying the phone outright AND then selling the iphone right before the iphone 7 comes out, next year? What are the pros and cons of all of this, aside from obviously the hassle of selling on eBay? I did get a txt msg the other day saying I'm eligible to upgrade now and get $100 off any new 4G LTE smartphone with device pmt. Does this mean I get $100 of the price of the iphone if I purchase the phone...or does this apply to upgrading as well? Thanks for the help!