Verizon: Any way to use my phone upgrade without changing my plan?

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http://androidforums.com – Hello everyone, My contract with Verizon is up and I'm allowed to get a discounted phone. However, I don't want to change my plan (I have an unlimited data plan). Is there any way to get an upgrade on a phone and NOT have to pay the full price of about ~$550 for a new phone? And what would you guys recommend for a new phone? I am using a Thunderbolt now, and like high-end phones. Should I wait? Also, off topic I know, and maybe taboo for this forum, but does anyone have/use a Windows phone? They seem pretty cool when I was playing with them... (General)