iOS 10.3 brings wifi and 4G calling for O2 (UK). NB: you need to disable their TU Go service (my request is pending) http://www.o2.co.uk/help/network-coverage-and-international/wifi-and-4g-calling

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  • @barryf A few hours later and I’m up-and-running. At home, where signal is patchy, I now get “O2 WiFiCall” in the top bar of my iPhone 7.
  • A few hours later and I'm up-and-running. At home, where signal is patchy, I now get "O2 WiFiCall" in the top bar of my iPhone 7.