Because I didn't want to use a computer, I chose a VoIP that uses the existing home phone system and connects to a modem between the cable and the WiFi. Out was Verizon, in came Lingo. That was 8 years ago. Never went back.
Advantage: unlimited and unmetered calls to US, Canada and Europe* (the latter a necessity for me). Less than $30/m.
Inconvenience: *slight fee for calling portables in Europe, no phone when cable is down.
Calls quality: mostly good depending on the circuit, but if it's not good, I just call back...
PS: usual disclaimer about any interests with the company (I didn't want to use "connection" in this context).