Description of Problem:
One of the problems with the Palm's tungsten models is that the AP
setting is hard coded in the phone drivers. To makes matters worse,
being Cingular official policy is that the Media Works package can not
be tethered to anything, so nobody at Palm wrote wrote a driver to use
wap.cinguar. Palm and Cingular only support the more expensive isp.cingular.

Solution:
Here is a solution for all tungsten users. It really isn't a secret, but
being I spent several mounts looking for a solution without success, I
figured I would post it now that I've got it working.

First, if your exact phone isn't listed as one of the specific supported
phone drivers, just pick the closest thing and pair the two devices. For
example I'm using the Nokia 3650 driver with the Nokia 6620.

Next go under preferences and network and create a new network
connection using the following settings.

Service Name: Cingular GPRS (name not important)

User Name: WAP@CINGULARGPRS.COM (ALL CAPS)
Password: CINGULAR1 (ALL CAPS)

Connection: LAN to Phone (you may need to create this under "edit
connections")

Up till now everything is the same as with a computer connection, but
this is were some hacking was required to get it to work. Palm's default
scripts used tags such as GPRS1, GPRS2, and GPRS3. The problem is the
values of these tags are hard coded and can't be changed. In fact, I
haven't even been able find out what many of them send. Well forget them
as we are not going to use them.

Ok from the networking screen click "details" and a the Details screen
appears. Verify the following settings:

Connection Type: PPP
Idle timeout: 3 Minutes
Query DNS: Checked
IP Address: Checked Automatic

Next click "script" so we can totally rewrite the script.

Now you should see a screen with all the "GPRSx" tags. Click on the
first line and change the tag to "End". This will clear the entire
script go you can start from scratch.  Now change the script to the to
the following:

Send: atz
Send CR:
Send: at+cgdcont=1,"IP",WAP.CINGULAR","0.0.0.0",0,0
Send CR:
Delay: 1
Send: atd*99#
Send CR:
End:

Now save your changes and see if you can connect.

Enjoy