Hi-
I have AT&T as my ISP and I use my Axim to dial into it via my Targus 56K Compact Flash Modem, or when I have it hooked up to my PC and I'm online...
Actually AT&T DOES offer a program that you can download and put it on your Axim for the pocket PC, you'll want to goto:
http://www.wurd.com/eng/setup/WindowsCE/index.htm
I wouldn't recommend it though (b/c this is just a dialer), the only thing you have to do is set up (local) dial access number on your Axim and you get in, you can do that by using your Axim and setting up an Internet Conneciton via Settings... I just use my same access/ dial up number that my computer uses at home. I get my email on my Axim this way too and it works wonderful! Let me know if you have any other questions or you need any further help!
Shawn