I think this is pretty accurate. I have a smartphone and rarely talk to people (~1-2 calls/day) or text (~2/day), but I probably look at my phone 150 times a day for various other reasons (check time, games, web browsing, calendar, check my torrents, bus schedules, hockey scores (finally), email, music, etc). I'm probably average when it comes to phone usage. I'd guess that dumbphone's lower usage probably evens out with all of the people that are obsessed with their smartphone.