I'm another who has an A12 with NO built-in QR scanner. There aren't any switches mentioning QR in my camera or indeed anywhere on my phone... except that after an afternoon with Samsung tech help I ended up turning on a QR capability under developer options that was supposed to fill in for what I'm missing but actually only wants to do what it says: "Pair device with QR code". Frustration continues. The many free apps are full of 'accidental on purpose' clicks. Hate 'em
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