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Can some one explain me, what is the 4G voice?
I'm not sure if I understand your question. If you are asking about how a phone call goes through Verizon's network, they use voice over LTE service, where calls are over the 4G LTE part of the network. I learned this the hard way by accidentally shutting off the "use VoLTE" feature on my phone one time, and then couldn't make or receive any calls until I turned the feature back on!