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    O2 becomes the last major carrier to enable WiFi and 4G calling

    by 
    Matt Brian
    Matt Brian
    03.29.2017

    It took a while, but O2 has become the last of the four major UK carriers to launch WiFi and 4G calling on its network. The company confirmed today that iPhone 7 and iPhone 7 Plus owners can now make calls in "notspots" when a wireless connection is available, with other phones coming online "very soon."