Does COMCAST have poor quality phone service?

Does COMCAST have poor quality phone service?

I switched yesterday from Verizon FIOS to COMCAST and had terrible telephone calls today on the land line.

I think we were sold >100 GPS upload speed. So, I doubt the poor quality is due to a slow internet connection. But maybe the old Verizon FIOS phone number was what they called a POTS line, a Plain Old Telephone Service line. Those were the ones where you cold hear pin drop.

Did I move from a POTS Line to an Internet based phone? And is that the cause of the major drop in quality?

My new modem is...

Xfinity
Dual Band Wifi
802.11.ac

The phone cable goes into the back.

Would an Internet phone do better?

Is there anything I can do?

I really despise having poor phone quality and may go back to Verizon to escape a bad connection.

Suggestions?

Thanks
newbiewebSr. Software EngineerAsked:
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Dave BaldwinFixer of ProblemsCommented:
I have both a land-line and Comcast phone on a modem like yours.  The Comcast service quality is not as good.  The Verizon FIOS is also a digital service though it may be better quality.  Actually, even land-lines are now digital services except for the 'last mile' to the customer.  All long distance between phone companies has been digital for a long time now, at least 25 years.
newbiewebSr. Software EngineerAuthor Commented:
So, using a Wifi Phone would not help then?
nociSoftware EngineerCommented:
Wifi will only make things worse.   You will stack an eratic lossfull transmission method extra into the mix.
VOIP uses 20ms fragments to transmit voice data so latency beyond that might cause data problems.
WiFi als needs some time renegotiate keys so there will be noticable breaks in VOIP communication.
esp. if WiFi has not been configured to offer the least amount of choices in communication.

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newbiewebSr. Software EngineerAuthor Commented:
I am seriously considering switching back to Verizon FIOS. I had great voice quality and simply can not be in the communications business, at any level, if my voice and what I hear is randomly missed.

So, is this my only option?
nociSoftware EngineerCommented:
I am in the EU, so have no experience with Verizon / Comcast etc.
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