QR codes are a theoretically-simple way to send or receive information – they might hold a link to a website or app, contact information, ticket details, or a number of other things, and you can simply scan the QR code with your Android phone to get that data. But QR codes also aren’t things you’ll necessarily encounter regularly, so you might not be sure how to scan one when you do, which rather removes the convenience factor. Making things even trickier is the fact that the process can differ on different Android phones.
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