I hope im posting in the right section. Please move me or let me know. Now on to the question
When I sell a 4g phone be it on Ebay or craigslist, do I need to keep my Sim card or do I sell it with it and get a new one from vz?
Definitely keep your sim card. If it has been out of phone for more than 24 hours, it will be de-activated by verizon as a safeguard to protect your information on the card. When you need one, they are free at verizon.