Signal strength for voice

I could care less about boosting my signal for 3G or 4G data. All I want is to boost the signal for voice connection. I get messages easily, but voice calls are constantly dropping ... especially in the basement. I tried the Verizon Network Extender, but it loused up my wireless network. With today's techs, I would think there is something that can allow me to use the phone for it's true purpose - MAKING PHONE CALLS - without using my wireless network.

Please help a frustrated old timer. Thanks

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