I'm a little confused on this so I'm hoping that someone can clarify. If I get a new device I know I need to log in to my carriers BIS site (in this case Verizon) and update my PIN and ESN/MEID for the new device. My question is: Does this automatically release my old PIN and ESN from the BIS server or would I need to still contact my carrier and get it released?
A PIN is specific and unique to each individual device. It is possible that after
sending your old phone to warranty, and after they restore it, that someone
else receives that phone.