When I got my g3 at the Verizon store, the usually pretty knowledgeable sales guy told me I needed a new sim for the g3, that my old vgnexus 4gLTE sim would work (yes, it did) but with that old sim in I would NOT have any NFC at all. No google wallet, no Isis, no bump to share, Nada. He said that is because the new sim enabled NFC on the Verizon LG G3.
He also said I would need ISIS, since it was going to succeed where Wallet had obviously failed. Hard to like Verizon, isn't it...but that unlimited grandfathered data...sigh.