I *think* you can now port landline numbers to cell phones.

I still have a landline, just because out in the sticks the only internet we can get is DSL. I use it to call out sometimes when the cell signal is iffy. And it's nice to be able to call the answering machine when I'm away and there's a storm or whatever, just to make sure the electric is on.

If you've got good strong signal inside your house and cable or satellite or wireless 'net, I don't know why you'd need a landline.