How to block rf signals - how to block 3g signals

How to block rf signals,how to block 3g signals,I have 3 smart TVs, 1 laptop, 2 EBox T8V version 5 streaming boxes and 2 iPhones. I want to use my new ASUS RT-AC87U router when I have Spectrum install WiFi service. Should I use the modem provided...

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