Sure the easiest way to confirm would be to put your Cingular SIM in
the phone if it registers with the network then you are fine if it asks
for a subsidy code then you need it unlocked or need TMobile SIM and
service.

If you need to configure your Internet browser and MMS settings for
Cingular then go here to this link.

https://onlinecare.cingular.com/device-support/index.do

Once you have a working internet connection you may want to set up the
new mini opera browser (very cool!)

http://mini.opera.com