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I think you will need at least 3EERO units, yes the unit can serve as the router, to use telephone you would still need the separate telephone over Internet box unless you set up a completely web based telephone service
Sorry, there was a problem. Please try again later.Yes! The Eero (Pro) units are an excellent replacement. With 3,400 sq ft home, I'd go with the three unit bundle...especially with the number of devices you likely have needing wifi service. You will still need a cable modem that supports your internet speed from Cox. If you are buying their GigaBlast service (or think you might upgrade in the next few years), you need to select a DOCSYS 3.1 modem. Otherwise a DOCSYS 3.0 modem will do fine. As for your phone question -- if you mean using your wifi network to allow you to make and receive calls over wifi (vs the local Verizon, AT&T, or T-Mobile towers, then yes this will improve the quality throughout your home.
I would recommend:
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