We added a land line a few years ago. We are in an area that has no usable cell coverage. We lived here for awhile before we could get any form of communications with the outside world, we had to go into town to use a cell phone. So, as soon as we met the criteria, we had a land line installed. All the circuits were already used so the phone company had to install a new trunk cable and to tunnel under a State highway which involved the state and getting approvals to do so. Lots of time and lots of money went into getting us a land line. However, we are seniors and we got the basic "health & safety" rate of $40 for the installation. I'm sure it was more like $4k to do all that they did. We have a basic rate, but by the time the taxes and fees are added it's 4 times that cost. Still, to talk to folks from our house, it's the only way. Sometimes the cell will connect here, but rarely. We now have a satellite link so the phone is connected to wifi, but the calls over it are poor, text messaging mostly works, and the land line still works much better. However, we do have a problem with the land line when major storms come thru and may take a few days for the land line to be fixed.
IF, we had reliable cell coverage and internet linkage, we'd consider dropping the land line. (The land line has it's own power source and will work when the towers don't)