Also, the overall market is comparatively tiny. The estimates suggest that just 6 percent of iPhone owners are using Apple Pay, and that ratio only gets smaller when you look at the larger device shares of its rivals. About 4 percent of Samsung users are trying Android Pay, and a single percent of Android users are trying Google's offering. At the moment, leading this arena is like declaring yourself ruler of the local park -- it's just too small to matter to most people.

How does it get bigger, then? Expanding support to a wider range of devices is poised to help, since it'll increase the odds that your next device is payment-friendly. More places to pay will be important, too. However, Crone notes that the biggest obstacle may simply be the lack of distinct advantages of paying with your phone. If your banking card is within quick reach, why turn to your phone? Tech giants may have to provide added incentives to bust out your handset if they want you to forget about plastic cards.