4G Phone

This is going to be my first 4G phone
Am I going to need to buy anything extra? (sim? etc.) And will my unlimited
3G be grandfathered when I go up to 4g? On a galaxy note: I cannot wait.
<http://www.google.com/url?sa=X&q=http://www.droidforums.net/forum/galaxy-nexus-general-discussions/185090-going-my-first-4g-phone.html&ct=ga&cad=CAcQAhgAIAEoATAAOABA9ZPp9gRIAVgAYgVibi1VUw&cd=Yz1vswN2jyk&usg=AFQjCNH4njAcPh-x3RMZihWm8QzYMPv45A>