I have a landline because on 9/11/01 you could not get a cell signal. After the earthquake we had last August, you could not get a cell signal, either, and text messages were iffy.

It's an insurance policy.

Also if the electricity goes out for an extended period, I will still have a phone to use without requiring a battery recharge. I keep an old non-cordless phone in a drawer near the phone jack, and I plug it in when the power goes out. It's a Verizon line, so I don't lose it when the cable goes out.