Generic access network

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Generic network access is the protocol by which devices (including non-SIM devices) use the internet to connect to carrier services. Apple markets this feature as "Wi-Fi Calling" (for SIM devices) and "Wi-Fi Calling on supported iCloud-connected devices" (for non-SIM devices).

Further reading

- https://en.wikipedia.org/wiki/Generic_Access_Network

- https://support.apple.com/en-us/HT203032