I rcently bought an iphone 6s plus, and like it so far, ialso have an iphone 5s on tmobile, and an iphone 3gs that was on tmobile. I know I would get more if I sold the 5s on ebay, but I would like to have a backup iphone, and I can also give a phone to a family member. would the 3gs make a good backup phone? I would like to have a newer backup like the 5s, but I know I would not get anything for the 3gs, it would not be worth the hassel on ebay. on the other hand, I would like to get some money back from the expense of the 6s plus. any suggestions on what would be best? I know no one can decide for, just getting some input.