Here is the link on the Sony Ericsson website to download their
wireless manager:

http://www.sonyericsson.com/spg.jsp?cc=us&lc=en&ver=4000&template=ps1_1_3_3&zone
=ps&lm=ps1_1&pid=10153

After installing the software, use the Connection Wizard to set up your
connection. I set up 2 connections on mine. I am not an expert, but the
choices I made below seem to work best for me.
1) On the first page enter the connection name. On the first connection
I used EDGE-GPRS Accelerated. Note the name field will not accept a /.
2) On the second page on the drop down menu under "Choose Network"
highlight Cingular, then click "Next".
3) On the third page, click "Advanced", then the "Compression" tab, and
check both boxes, then click "OK"
4) Click "Next", "Next", and "Finish
5) I ran the Connection Wizard a second time and used EDGE-GPRS
Non-Accelerated in the name field, and did not check the boxes as above
for compression.
6) Under "File" on the menu of the Wireless Manager I clicked
preferences and on the Radio Power tab chose to have the Turn Radio On
button selected and the Reset card on shutdown button selected. On the
GPRS tab I checked the box to Establish GPRS Connection on startup, and
I chose EDGE-GPRS Accelerated for my connection in the pulldown menu.

I have been able to have both the Sony Ericsson Wireless Manager and
the Cingular Connection Manager 4.2.7.1 installed on my system at the
same time, but just having Cingular Connection Manager 4.2.7.1
installed on my system caused the e-mail problem with Norton AV to
persist, even though I was using the Sony Ericsson Wireless Manager for
my connection.

I did e-mail Cingular regarding the conflict between Cingular
Connection Manager 4.2.7.1 and Norton Antivirus 2005. Their Customer
Support Dept. replied that they would "bring this issue to the
attention of the appropriate department".