There seem to be a few threads from existing iPhone users already in the upgrade program and wondering whether/how to exercise their option, but I have a different question. I'm not a current iPhone user. I'm considering buying the 7 but would like to be able to sell it and get next year's version if Apple releases something that's a huge leap forward. My current (non-Apple) phone is 5 y.o. and barely functional, so I can't wait. How would buying the 7 upfront at full price and hoping to sell it later compare to joining the upgrade program? FWIW, I'm looking at the regular 7 (not Plus) matte black 32 GB version with T-Mobile. Thanks in advance to anyone who can explain.