incrediBILL - 2:03 am on Aug 31, 2012 (gmt 0)
The only reason we really keep the landlines is it's usually the only way to make a call after an earthquake as all the cell phones go busy immediately. The other issue is that I've had the same number almost 25 years and anyone I haven't heard from in eons can still reach me so if I were to drop the landline I'd redirect it to the smart phone.
FWIW, if you want to get rid of the telemarketers you can do what I did and put an intermediate answering machine with an auto-attendant between you and them. Most can't pass through the system and just get bounced and they'll never leave a message so problem solved.
The other way to get rid of telemarketers that is both cheap and effective, which I use on my other line, is to use language that's so mean and vile it makes their ears bleed. They do not call back and they certainly don't keep the number of their list :)