You should also verify that Enable LTE is set to "Data" or "Voice & Data" in the Cellular settings. The officially supported devices for Google Fi are primarily Pixel 2 and newer models.
How Google Fi Smart Features Manage Data Dependency on iPhone
Power on the device and connect to Wi-Fi. You must navigate to Settings > Cellular > Cellular Data Options > Voice & Data and select "LTE" rather than "5G" or "Auto.
This configuration allows your phone to maintain a data connection for calls, which is the backbone of the Google Fi experience. Insert the Google Fi SIM card into your iPhone.
How Google Fi Smart Features Manage Data Dependency on iPhone
If you see an entry starting with "A", you can cross-reference this number online to identify the exact iPhone variant. The most critical setting is the "Preferred Network Type.
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