We have very basic service on landline... no long distance, no caller id, no call waiting.
Just few months ago, we ran into situation that made us more aware of why we need to keep the landline... and to make sure that at least one one phone is corded and not cordless!
One morning, my dad called me at work from his cell phone, but I could barely hear him. I called right back and couldn't make the connection. I called on home phone and no answer. My mom is always home, so that made me wonder if they were out shopping or something and were trapped or something. He drives old van, so it was possible that it wasn't started and needed me to pick him up. My brother and his wife were on their out-of-country trip. He called me few more times and I could barely hear him. This was over 2-3 hours. I REALLY started to worry about them by this point. I wasn't able to make contact with them. It wasn't like them to be out for that long. And if they did, they wouldn't have a reason to call me multiple times. Finally, I was able to make out what he was telling me ( I think he went outside of home to call me at that time) at one point... they had power outage. I called the power company and found out that due to some accident in their neighborhood, over 400 homes had lost power since 9 AM and won't be excepting back till 6 PM or so.
THAT explained the whole thing. They don't have good cell reception, so they're using cell booster. Of course, due to power outage, their cell phones weren't working well. And their landline phone didn't work because all of them were cordless! First thing we did was to get a corded phone!