IT means they removed their SIM card, probably to put in their current phone.
a SIM card is a tiny chip containing the owners phone number and account information. It would be appropriate to move it to a new phone.
you can run the ESN number through Verizon's activation website or Swappa's ESN checker to see of it's a valid phone.
(not been reported lost or stolen)
please dont don't buy a phone from Craigslist. Amazon and eBay guarantee your purchase, CL doesn't.
Yes. if you already have service, your SIM card can be moved if it's the same size.
or you can start service and Verizon will provide you with a SIM card with your account sign up.
the phone is also unlocked for use with SIM cards from other carriers.