We’ve had Ooma for several years now and like paying just around $5 per month. We have the basic service. Excellent service- of course internet out means rebboting it. With two of us at retired home most of the time we merely turn on our pay per minute cell phones when away from home. I have warned people that texts et al to my cell phone may not get looked at for months (nor will an email be received instantly).
With a family I can see having a home phone so a caller can talk to anyone and not need to try a specific individual. Whoever is handy can answer and get messages. Calling person A, B and C because they may not be at home or pass the message- ouch. Plus, having a phone with multiple handsets in different areas instead of needing to have a cell phone with you at all times- yuck.
We hooked up our Ooma directly to the modem, with the main phone station there as well.