Max data rate is 144 kbps , not a fast as wifi on my SL-6000 but very very usable. A page on wifi took about 6 seconds to load with alot of gifs and animation and the same page took about 11 seconds plus I was using the sprint card in my basement were coverage isn't that strong. The phone number is tied into yyour account and if you use a pocketpc you can use it as a phone also software is being worked on for the same features for the zaurus. I also use it for my voip accounts because it works with tkcphone and calls to regular phones with my net2phone account which is very cheap,,,cheaper than pre-paid phonecards.