Probably stupid question, but now that we have a solution on the Nexus Verizon to install Google Wallet, I was wondering how to use it? When I go to store what should I see at the register in order to use NFC? Do I need to open NFC app on my phone in order for this thing to work, and then bump phone on the "card reader" at the register? What are other uses of the NFC besides payment in the store? Thanks.