Most smartphones have Near Field Communication, or NFC technology, built in these days. If you’ve ever used a mobile payments app like Samsung Pay or Google Pay, you already know how NFC works. In a ...
They don't require a battery. They don't need to be plugged into anything. You just wave them at a sensor and then you're on your way to pay for goods, travel on a subway, or ride on a bus. NFC cards ...
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