Here, you will find the following services to set up your Internet and MMS settings for your Unlocked phone depending on your Service providers.

T-Mobile: This link will take you to the T-mobile site where you will be able to select the model of your phone, and input your mobile number. You will get a text message for the service you have chosen to send your phone. You will get a PIN code which you will need to run the script the Carrier sends you. Once everything is complete you will get a message that says so.  Your DONE!.

AT&T: This link will take you to the Cingular Support section where you will be able to select the model of your phone. You will then be able to select what settings you would like to set up on your phone and you will be provided with a step-by-step instructions with picture on how to set up your phone to browse the internet or you may follow the settings below.

1. press the Menu Key. 
2. Scroll to and select Settings.
3. Scroll to and select Web Access. 
4. Scroll to and select Web Sessions. 
5. Highlight "MEdia Net" and press the Menu key.  
6. Select Set as Default to set MEdia Net as
   the default Browser Profile. 
7. With MEdia Net highlighted press Menu. 
8. Select Edit. 
9. Verify the following:
   
   They are case sensitive
   
   Name: Cingular
   Homepage:http://device.home
   Service Type 1: WAP
   Gateway IP 1: 66.209.11.61
   Port 1: 9201
   Domain 1: <blank>
   Service Type 2: WAP
   Gateway IP 2: <blank>
   Port 2: 9201
   Domain 2: <blank>
   DNS 1: <blank>
   DNS 2: <blank>
   Timeout: 15 minutes
   CSD No.1: <blank>
   User Name 1: <blank>
   Password 1: <blank>
   Speed (Bps): 9600
   Line Type 1: Modem
   CSD No. 2: <blank>
   User Name 2: <blank>
   Password 2: <blank>
   Speed (Bps) 2: 9600
   Line Type 2: ISDN
   GPRS APN: wap.cingular
   User Name: WAP@CINGULARGPRS.COM
   Password: CINGULAR1 

For Settings to be sent automatically to your Samsung device for example for Carrier I-Wireless, Centennial Wireless, Cellular One of San Luis Obispo, Cell one, Edge Wireless, Suncom, and many others. Please visit the following link only if you have a Samsung model device. Samsung WAP Settings

More WAP settings from other Carriers will be added shortly.