Wechat phone book free call is really free of money?

  
WeChat phone version 3.0 version of the new online, added a free call function, claiming to be free to call a friend? Subverting the WeChat of SMS, is it still necessary to subvert the call? Can I make a free call on the free call of WeChat phone book? If it is true, the end of China Mobile, China Unicom and China Telecom will come.
Using the free call function of WeChat phone book, both parties need to install WeChat phone book and open the free call function, which means that the free calls between the two parties are transmitted through 2G/3G/4G or WiFi network, which consumes the cost. 2G/3G/4G traffic will still be charged by the operator for traffic charges. To put it bluntly, the free call function of the WeChat phone book is equivalent to QQ voice.
So, the WeChat phone book still can't make free calls, because he just needs the free voice of the network.

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