VoLTE stands for Voice over LTE. Traditional cell networks use two separate protocols for phone calls and data. 4G killed this idea and instead moves the phone calls onto the data protocol/network, leading to the name “Voice over LTE”. Devices that don’t support VoLTE just switch back to 3G/2G for phone calls, however, many carriers around the world are preparing to shut down older 3G and 2G networks, leading to the current crisis.
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