I agree with above, however there are a couple of devices that still look for a real telephone line, the FAX option in my wireless printer expects a phone line, my wife's medical equipment expects a phone line, for example. We use a completely wireless phone system that is plugged into the house phone wiring which is then plugged into the modem. This gets all of our equipment working.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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