I have Verizon also and Yahoo setup, works great - here is a cut/paste from
www.blackberry.net
How To - Integrate a Yahoo Mail Plus account with your BlackBerry account
Last Updated: 20 July 2005
Article Number: KB-03728
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Summary
This article applies to the following:
BlackBerry Internet Service™
BlackBerry® account
Yahoo! Mail Plus
Important: Some service providers do not support integration with all email accounts. Contact your provider to verify that Yahoo! Mail Plus is supported.
If you are a Yahoo! Mail account holder, you must subscribe to Yahoo! Mail Plus in order to integrate your Yahoo! Mail account with your BlackBerry account.
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Details
To integrate a Yahoo! Mail Plus account with your BlackBerry account:
Connect to the BlackBerry Internet Service web site and log in to your BlackBerry account.
On the navigation bar, click Profile.
Under Email Accounts, click the hyperlink other email accounts.
Click Add Account.
Type the email address, user name, and password in the appropriate fields and click Submit.
Click the I have enabled POP access to my Yahoo! mailbox and want to add it option, then click Next.
If you see the message “Your email account has been successfully set up,” the integration is complete. The integrated account is listed with a green check mark in the Status column (on the far right). New email messages will begin appearing on the handheld from the integrated account.
If you see the message “We were unable to configure this mailbox,” the integration failed for one of the following reasons:
Your Yahoo! Email Plus account is not registered.
You entered the wrong account information. Repeat the process.
There is a temporary connection problem between the BlackBerry Internet Service and the Yahoo! Mail web site. Try integrating your account later.