I bet if the numbers were 25-29 year olds who had all left home, it would be significantly higher. I bet very few people in that bracket are actually making the decision to activate a landline in their own places.
I am 29 for a few blessed more months, and I have been landline-free since, well, leaving home for college and my own place. Had I been one of those stay-at-home-until-your-30s types, though, I would fall on the landline side of the statistical breakdown.
It also enables me to use a long distance calling card for free, so I can make calls that would cost far in excess of $4 to call my family in the UK.
We do have many friends who are solely cellular homes. It's cheaper for them to pay for low minutes on a smartphone plan than it is to get a land line.
Even if they were free I wouldn't have one, since when I did have a landline pretty much every call was phone spam.
I'm single and only have a cell, but my friends with kids inform me that landline for a family is the way to go. I see the logic in their argument.
Clear, high quality voice communication. I rarely talk on my cell phone. It's essentially for text. I try to call people at their landlines.
Then I moved to Silicon Valley. I've been counting down the days for Verizon to pick up the iPhone, ever since.
There's nothing wrong with the iPhone. AT&T, though...
They should have told us what percentage of those in this age group, who live on their own, have only cell service. But we can make a decent guess.