You can scan a QR code using the camera on your smartphone, tablet, or computer — however, you may need to download an app.
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How to Share Your Android's Hotspot Using a QR Code
If you find it inconvenient to share your Android phone’s hotspot details manually, you can create a QR code that others can scan from their devices to connect to your hotspot. It's easier than you ...
You can add new contacts to WhatsApp manually from the Chats tab or you can scan someone's QR code within the app.
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