Sorry, forget previous posts. I doublechecked and I had Costco mixed w/ Amazon. If it's a swap, purchasing a phone via Amazon will do nothing to your current contractual terms w/ Big Red. Amazon just sells phones for Verizon, nothing more, if it's just an upgrade. You still have all warranty coverage from Verizon. Here's the catch on swapouts, Amazon will have to replace it w/in 14 days of purchase from then on you have to swap via Verizon for another 2 weeks. It is an insurance claim from then on. You'll need to contact Verizon about a price difference refund. I doubt you'd get credit for it since it was bought 3rd party.
Things get tricky if you return the phone to Amazon for good . Only to purchase the cheaper Verizon online offering shortly thereafter?
Read this for more info.
AmazonWireless