Welcome here I've got Alcatel 1s, and I'm going to show you how to allow the camera up to scan qr codes at this device. So at first we have to tap on the camera button here to open it and for now, as you can see, we are in the standard photo mode. So let's change it because the Alcatel gives us the other amount, only to scan interior codes, and this is really cool here. We can do it by just simply sliding to the left, and here we have access to other modes of this camera. One of this is the qr code mode. So, by tapping on this we can start scanning Mrs by just putting them inside the square, and this is really easy.
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Source : HardReset.Info