I hear a lot of comments about keeping landlines for answering machines.... cell phones have answering machine built in. It's called voice mail. You can play it over and over again, forward it to someone else, block the calls, screen the calls. Works great.
For those of you that like having phone extensions in your house, you can keep those with a cell phone. We dropped our landline and had the number ported to an old iPhone5 that remains on a charger 24/7. We kept our same phone number that everyone we know uses. No changes to them. We have 3 cordless phones in our house and a wired phone out in the detached garage. The cordless phone base station is bluetooth capable, and it is paired to the iPhone5.
When grandma calls the same number she's called for 35 years, it rings the iPhone5, that rings all of the cordless phones and the wired phone in the garage. We pick up a handset and start talking.
Conversely, if we want to make a call, we pick up any handset in the house and dial the number we choose. It calls out on the iPhone5 and people on the other end see it as our regular number. Again, nothing changes for us or them.
Towards the end of our landline usage, we had several problems with line degradation. They came out 2-3 times in the last 2 years, switched to a few different pairs of the old underground, ran new lines overhead after that failed, changed lines in a "box down the road" a couple times, etc... I'm glad to be done with it.