Apple and Google have introduced secure digital ID card technology ... easier these days to keep track of which phones don’t ...

Often the term will bring to mind the ability to pay by holding your phone over a reader, but the system can also use NFC tags embedded in credit cards, ID card, passports, and the like.

Google Wallet is the Android tap-to-pay platform of choice, but over the past few years, Google's been building out Wallet functionality to include features like digital ID cards and hotel keys.

Powered by “a nice little NFC EEPROM from NXP”, (the NT3H1101) the business card even has an energy harvesting mode. Moreover, one can interact with the card via four buttons and an LED.