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The era when a mobile phone had to "drop" its speed and switch from 4G to good old 3G or even 2G to make a phone call is officially coming to an end. While couch analysts were predicting the death of classic calls under the onslaught of instant messaging, a quiet technological revolution has taken place in the bowels of telecom networks. Voice has not disappeared. It has simply become fully digital and learned to live inside high-speed networks. Without unnecessary pathos and boring engineering terms, let's figure out why traditional switching is becoming a thing of the past and how VoLTE and VoWiFi technologies have become game changers.

«I heard a legend that in ancient times, before the Great War, you could call each other on your mobile phone and talk without the Internet or instant messengers,» Sergey «Flash» Beskrestnov, an advisor to the Minister of Defense, once wrote on social media. In the comments to this post, he explained that, like many thousands of Ukrainian servicemen, he has a systematic problem with online stores, banks, government agencies, and utilities. «They call my mobile, but for me it has been ‘not available’ since the beginning of the war,» added «Flash.»