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並前往https://www.o2.co.uk/help/network-coverage-and-international/wifi-and-4g-calling

Wifi and 4G Calling | Help & Support

iPhone setup. Set up Wifi and 4G Calling for iPhone. How to set up Wifi and 4G ... 4G Calling (also called Voice over LTE or VoLTE) lets you make calls using ...

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