I have a land-line and a cell phone, never use the cell unless I break down on the road. The reason I love the land-line is that, with the old rotary phone I have, I can get calls out in a power outage. This is very important when you're elderly as we are.
I could use some protection from telemarketers though. No matter how many times I add or name to the "do not call list" we still get two or three calls per day. I've cut those down by asking the caller for the federal I.D. number as suggested on a website and they usually hang up right away and don't call for some time. I have been sworn at before they hang up however :-)/