Here's a lot more info. You may want to read about WiFi offloading on page 6. On 07/29/2018 12:14 PM, Andrei Borzenkov wrote:
Отправлено с iPhone
29 июля 2018 г., в 17:34, James Knott
написал(а): WiFi is available on many phones here. It uses the same protocol as VoLTE (Voice over LTE), but connects via WiFi. If the phone also has VoLTE enabled, it can transition seamlessly between WiFi and the cell network. WiFi calling has absolutely nothing to do with VoLTE. The whole point of WiFi calling is to allow connection to *any phone* without any need to have data services on other end. It connects to your mobile operator over internet which then forwards call over voice network. Actually WiFi calling is the most interesting exactly when you want to reach someone on normal (e.g. PSTN) phone, as otherwise there are enough applications you can use to communicate over internet directly. WiFi calling is charged here according to home rate, making it attractive in roaming.
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