The following Carrier APN Settings are only for the United States.

T-Mobile:

APN: wap.voicestream.com or internet2.voicestream.com
User Name and Password: guest (wap) / leave it blank (internet2)
NEW APN: epc.tmobile.com
User Name and Password: Leave it blank
Sidekick: hiptop.t-mobile.com
User Name: dummy Password: dummy

Primary gateway IP: 216.155.165.50
Port: 8080
Secondary gateway IP: 216.155.165.50
Port: 8080
MMS Mmsc Server: http://216.155.174.84/servlets/mms Proxy: 216.155.165.050:8080

Cincinnati Bell Wireless:

WAP Settings
Settings Name: CBW WAP
Homepage: http://wap.gocbw.com
Session Mode: Permanent
Connection Security: OFF
Data Bearer: GPRS
Bearer Settings:
GPRS Access Point: wap.gocbw.com
IP Address: 216.68.79.199 (216.68.79.202 for WAP 2.0 Handsets)
Authentication Type: Normal
Login Type: Automatic
User Name: cbw
Password: Leave it blank

MMS Settings
Allow Multimedia Reception: YES
Incoming Multimedia Messages: Retrieve
Settings Name: CBW MMS
Homepage: http://mms.gocbw.com:8088/mms
Session Mode: Permanent
Data Bearer: GPRS
Select Bearer Settings
Select GPRS Access Point: wap.gocbw.com
IP Address: 216.68.79.200
Authentication Type: Normal
User Name: Enter cbw
Password: Leave it blank

GPRS Settings (Non VPN)
Settings Name: CBW GPRS
Session Mode: Permanent
Connection Security: OFF
Data Bearer: GPRS
Bearer Settings:
GPRS Access Point: web.gocbw.com
Authentication Type: Normal
Login Type: Automatic
User Name: Leave it blank
Password: Leave it blank

GPRS Settings (VPN)
Settings Name: CBW VPN GPRS
Session Mode: Permanent
Connection Security: OFF
Data Bearer: GPRS
Bearer Settings:
GPRS Access Point: internet
Authentication Type: Normal
Login Type: Automatic
User Name: Leave it blank
Password: Leave it blank
Create a Profile and set the Profile Name to cbwifi (all lowercase).
Set the SSID (or Network Name) to cbwifi (all lowercase).

Cingular:

APN: wap.cingular (lower case)
PDP_Type: IP
Gateway IP Address: 66.209.11.61
Port: 9201
Home Page: http://device:home or http://device.home
Session Mode: Permanent
Connection Security: On
Authentication Type: Secure
Login Type: Automatic
User Name: WAP@CINGULARGPRS.COM (All upper case)
Password: CINGULAR1 (All upper case)
MMS Settings:
Service Name: MMS
Server Name (mmsc): http://mmsc.cingular.com
Web Session Name: MMS

Rogers:

APN: internet.com
Primary gateway IP: 172.25.0.107
Username: wapuser1
Password: wap

APN: internet.com
Username: guest
Password: guest
MMS Settings:
MMSC: mms.gprs.rogers.com
APN: media.com
Username: media
Password: mda01