OK, now I have an update. I searched or "siemens s46 modem" on google and found:
http://forums.attwireless.com/attws/...message.id=438
Here's what I did to get connected via the IR port:
1) phone - set serial connection to IRDA
2) on Axim, define a new connection with the following settings:
8N1, no flow control
clear the "wait for dial tone" check box
use the phone number *99#
leave user id & password blank
set up custom dialing location with "G" as the value for local, long distance, and international numbers.
I was then able to connect and access a web page at a decent speed, even with a low signal strength.
---> update <---
Better yet, go to
http://support.attwireless.com/awswl.../s46/index.jsp for AT&T's instructions on setting up various PDAs for use with the S46 phone.