To connect using a connected WiFi phone, iPhone 12, follow these steps:
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1. Turn on the WiFi function of the iPhone 12 and search for connected WiFi devices.
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2. Find the WiFi device you want to connect to, make sure its name and IP address are correct, and click it.
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3. In the dialog box that is displayed, select Connect to this device and enter the name and password of the WiFi device.
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4. If the WiFi device requires authentication, it needs to enter its authentication information (such as user name and password).
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5. Wait a few seconds until the iPhone 12 successfully connects to the WiFi device.
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6. Check whether the iPhone 12 has been connected to the WiFi device, you can find \"WiFi\" in \"Settings\" and check the connection status.
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If you need more detailed instructions, you can refer to the iPhone 12's official documentation or use another app to help.