Right now Verizon is offering $200 trade-in credit for the 16 GB iPhone 4S. I wasn't thinking of upgrading yet, but with this deal the 5s is pretty much free and all I would pay is the $35 activation fee. Is it worth upgrading since the 5s has been out for so long? Approximately how much can I expect to get in trade-in value for my iPhone 4S once the 6 is released (Verizon is offering $100 and Best Buy $50 for the iPhone 4, so I'm guessing somewhere around there). I know I could wait forever if I'm always waiting for the next big thing to be released, but I'd rather get a phone shortly after it is released instead of one that's halfway through its life. On the other hand, this deal seems too hard to pass up unless the opportunity will come along again later in the year. Any thoughts?