This Pew Internet & American Life Project report says “some 34% of internet users have logged onto the internet using a wireless connection either around the house, at their workplace, or some place else. In other words, one-third of internet users, either with a laptop computer, a handheld personal digital assistant (PDA), or cell phone, have surfed the internet or checked email using means such as WiFi broadband or cell phone networks.Users of wireless access show deeper engagement with cyberspace - at least when focusing on two basic online activities, email and news.A mong the 34% of internet users who have gone online wirelessly:
72% of wireless users check email on the typical day, compared to 63% of home
broadband users and 54% of all internet users.
46% get news online on the typical day, compared to 38% of home broadband users
and 31% of all internet users.
The differences between wireless and home broadband users are statistically significant and notable because most wireless users (80%) have broadband connections at home.The findings suggest that the ‘relentless connectivity’ afforded by wireless access represents a different quality in online behavior.It is possible - even likely - that lifestyle circumstances such as one’s job may require lots of email connectivity and associated wireless access. But the boundaries between checking email on a portable device for work or personal purposes can be very blurry; having such work-driven access may foster greater frequency of personal emailing or other kinds of online activities”.

Wireless Internet Access