I had a standard POTS copper phone line about 15 years ago. FIOS came to the area and I jumped at it. I kept my phone number, but my connection to the telco was no longer powered by their big battery (I worked for Western Electric many uears ago, and the basement of the building was full of gigantic lead-acid batteries) and powered by my home’s electric utility. Power there was not reliable - we would lose power for two days every time we had a storm, and we had two or three each year.I have a land line and for what it costs I will never part with it.....I have had to use it when we have power outages here.....
FIOS was a huge improvement over dial-up Internet and satellite TV (which also failed whenever the weather acted up).
When we moved to Idaho six years ago, we kept our cell phones. We now have cable Internet, but no need for land lines. YMMV, of course.