I noticed your post, LENNYEDGE. I understand your desire to upgrade your devices. Are you experiencing any service issues with your phones? If you are, we can certainly troubleshoot with you to improve your wireless experience.
You can confirm your upgrade options if you login to your My Verizon account at this link: http://vzw.com/Upgrade
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Whenever the device no longer suits you, and no longer receives software updates. Generally after two years. No need to go on the "One every two" cycle the market wants to you go on.