I took this idea from another forum and it seems to be very helpful. Please let me know if you settings from a carrier not listed here.

T-Mobile USA

GPRS CONNECTIONS:
Description: T-Zones GPRS
Connects to: The Internet
Access Point: internet2.voicestream.com (or internet3.voicestream.com)
User Name:
Password:
Primary DNS: 216.155.165.50
Secondary DNS: 216.155.165.50
IP Address:

Description: T-Zones WAP
Connects to: The Internet (or try directly to WAP network)
Access Point: wap.voicestream.com
User Name:
Password:
Primary DNS: 0.0.0.0
Secondary DNS: 0.0.0.0
IP Address:

PROXY CONNECTIONS:
Description:T-Zones WAP Proxy
Connects From: The Internet
Connects To: WAP Network
Proxy (name:port): 216.155.165.50
Type: WAP
User name:
Password:

Settings-Data Connections:
Internet Connection: T-Zones GPRS
WAP Connection: T-Zones WAP

INTERNET EXPLORER > MENU > OPTIONS > CONNECTIONS:
Tick 'automatically Detect Settings'

MMS setup
Settings-Data Connections - Edit GPRS connections
Description : T-Zones MMS
Connects to : MMS connection
Access point: wap.voicestream.com

Settings - Accessories - MMS setup
First field: T-Zones MMS
IP: 216.155.165.050
Port: 9201
Mmsc Address: : http://216.155.174.84/servlets/mms

USA Cingular

Create new proxy connection
Description: Cingular WAP proxy
Connects from: The Internet
Connects to: WAP network
Proxy (name:port): 66.209.11.61
Type: WAP
Username: blank
Password: blank

Create new GPRS connection.
Description: Cingular WEB
Connects to: The Internet
Access point: ISP.CINGULAR
User name: WIXDC001@W5.MYCINGULAR.COM
Password: ZXY203DC9K0402
Primary DNS: 0.0.0.0
Secondary DNS: 0.0.0.0
IP address: (blank)

Create new GPRS connection.
Description: Cingular WAP
Connects to: The Internet (or try directly to WAP Network)
Access point: wap.cingular
User name: WAP@CINGULARGPRS.COM
Password: CINGULAR1
Primary DNS: 0.0.0.0
Secondary DNS: 0.0.0.0
IP address: (blank)

Create new Dial Up WAP Connection
Description: Cingular WAP CSD
Connects to: The Internet
Country code: ?
Dialling code: ?
Phone number: ?
Username: WAP@CINGULAR.COM
Password: CINGULAR1
Domain: (blank)

In data connections:
Internet connection: Cingular WEB
WAP connection: Cingular WAP

In Internet Explorer
goto connections and select 'Automatically detect settings'

AT-T GPRS
CONNECTS TO: The Internet
ACCESS POINT: proxy
User Name: blank
Password: blank
Primary DNS: 0.0.0.0
Secondary DNS: 0.0.0.0
IP Address: blank

AT-T WAP
Connects To: WAP Network
Access Point: PROXY
Username: blank
Password: blank
Primary DNS: 0.0.0.0
Secondary DNS: 0.0.0.0
IP Address: 010.250.250.250

In the Data Connections Main config screen I have the following:
Internet Connection:
AT-T GPRS

Work Connection:
None Available

WAP Connection:
Automatic

Secure WAP Connection:
None Available

Now Under PROGRAMS->ACCESSORIES->MMS Setup have
AT-T GPRS Selected in the top

IP: 010.250.250.100
Port: 9203
MMSC Address: http://mmsc.mobile.attwireless.net
Message Expiry: Max
Delivery Report: Unchecked
Read Report: Unchecked
Hide Sender: Unchecked
MMS Download: Auto

my 3650 has 216.155.165.50 as the gateway ip address for t-zones. when i put it as name server, MMS becomes the default connection and i cannot change it back to t-zones.

Since you're taking them directly from http://www.Modaco.com including the format you may as well post the link to the thread that you took them from:

http://smartphone.modaco.com/viewtopic.php?t=4861

__________________
.:: Nick C ::.

i tried the settings posted on this thread but it would not work. it gives an error that i should make sure i have network coverage. I know i do because the gprs signal is on and also i have t zones. do i have to have a patch to make it work. I bought my mpx200 from europe it is a factory unlocked version. WHat should i do?
\

Have you doubled check all the settings? The most likely explanation is that a setting got missed or was mistyped.

Anyone have settings for the MPx200 in the UK for o2 payg ?