Here it is... full step-by-step internet/wap/mms setup for Rogers for the P910a. Tested everything for the last week and works perfectly!

Internet.com setup

Applications> Control Panel> Connections Tab> Internet Accounts> New
Account Name: Rogers GPRS
Connection Type: GPRS
Advanced
Server Tab
Username And Password Required: checked
Username: wapuser1
Password: wap
Address: internet.com
Log In Tab
Get IP Address Automatically: checked
Get DNS Address Automatically: checked
Proxy Tab
Use Proxy Server: do not check
Other Tab
Enable PPP Extensions: checked
Authentication: normal
Done> Done> Done

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Rogers WAP Setup:

Step 1:
Applications> Control Panel> Connections Tab> Internet Accounts> New
Account Name: Rogers WAP
Connection Type: GPRS
Advanced
Server Tab
Username And Password Required: checked
Username: wapuser1
Password: wap
Address: goam.com
Login Tab
Get IP Address Automatically: checked
Get DNS Address Automatically: checked
Proxy Tab
Use Proxy Server: do not check
Other tab
Enable PPP Extensions: checked
Authentication: normal
Done> Done> Done

Step2:
Applications> Control Panel> Connections Tab> WAP Accounts> New
Account Name: Rogers WAP
Internet Account: Rogers WAP (from drop down list)
Use Proxy: checked
Address: 208.200.67.150
Port: 9201
Done> Done

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Rogers MMS Setup:

Step 1:
Applications> Control Panel> Connections Tab> Internet Accounts> New
Account Name: Rogers Media
Connection Type: GPRS
Advanced
Server Tab
Username And Password Required: checked
Username: media
Password: mda01
Address: media.com
Log In Tab
Get IP Address Automatically: checked
Get DNS Address Automatically: checked
Proxy Tab
Use Proxy Server: do not check
Other tab
Enable PPP Extensions: checked
Authentication: normal
Done> Done> Done

Step 2:
Applications> Control Panel> Connections Tab> WAP Accounts> New
Account Name: Rogers Media
Internet Account: Rogers Media (from drop down list)
Use Proxy: checked
Address: 172.25.0.107
Port: 9201
Done> Done

Step 3:
Applications> Control Panel> Connections Tab> Messaging Accounts>
MMS Tab
Service center address: mms.gprs.rogers.com
WAP account: Rogers Media (from drop down list)
Automatic: on
Download size: set to your own liking
Done> Done

Enjoy...