Using the QR Code
1. To share a Wi-Fi network with another Android device, you first need to be connected to it (or at least have the details saved on your phone). Navigate to your Internet settings, either by long-pressing the Internet option within your Quick Settings on an Android 12 device, or by going to Settings -> Network and Internet -> Internet.
2. Select the Wi-Fi network you'd like to share by tapping it from the list of networks that appear. If this is the one you're currently connected to, it'll be at the top of the list.
3. Within the Network Details screen, you'll have the option to Share with an icon of a QR code just above it. Tap this and a QR code will appear on-screen (and conveniently, the network password will be listed just underneath it). Depending on the security settings on your phone, you might have to scan your fingerprint to verify your identity before you reach the QR code.