Do you have Near Field Communication (NFC) built into your device? Probably not. But that doesn't really matter, because the future of smartphones has NFC well under its wing. At the moment, you'll find that very few devices (such as the Nexus S and Galaxy Nexus) are NFC compatible, thus making Google Wallet still relatively new to the public. Despite its unpopularity, Juniper research predicts NFC payments will hit $74 billion by the time 2015 rolls around.