How to setup an email account from Gmail, Yahoo Mail or Microsoft Exchange mail using T-Mobile prepaid in Blackberry phones?

First one needs to get the a prepaid account with the blackberry Internet service which is as of today $10 extra than the standard unlimited $50 plan.

After getting the plan. You might need to check with the Customer service if your Service Plan is updated with the Blackberry Internet service.

You would receive a mail titled
Subject: Service Plan Update
The Service Plan for your Blackberry device has been updated.

Your new service plan supports up to 11 email addresses
1-Blackberry.net
10 - other email addresses(e.g Yahoo, Google)

If your inbox doesn't have this mail call the T-Mobile customer service to get this configuration done.

Unlike traditional Blackberry methods of setting up the email addresses. In T-Mobile you need to set it up differently.
You first need to register your account with T-Mobile
http://www.t-mobile.com/

After registering, login to t-moble.com and on the menu hover over mobilelife - > Email and Text Tools
(see attached image)

Then on the screen click on "Setup Email Account".

On this screen enter the company provided email address (Microsoft Exchange)

You could also do the same process for adding Yahoo, Gmail accounts.

Thanks to Chris from T-Mobile customer service for acknowledging that there is a way to add email in T-Mobile Prepaid plan.