Just found this on the Verizon site......
http://support.vzw.com/faqs/Account%...ion.html#item7
How do I change my calling plan?
You can change your plan anytime at My Verizon or by calling Customer Service by dialing *611 from your wireless phone or (800) 922-0204 from any phone.
All Verizon Wireless plans require a Verizon Wireless device.