details are as follows
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1. To connect to wifi without entering a password, you need a QR code from a connected mobile phone.
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2. First, open a wifi connected mobile phone, drag down the shortcut bar, long press the wifi icon to enter the wlan page, or click Settings.
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3. In the second step, after entering the wlan page, click the connected wifi, and a QR code will pop up on the properties page
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4. Step 3: Open the browser with scanning function in the mobile phone that is not connected to WiFi, click to open the scanning function and scan the QR code.
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5. Step 4: After successful scanning, click on the middle of the page to confirm the connection.