Vonage - The business of better

Investor Relations

Stockholder Services

If you are a registered stockholder and have questions regarding your holdings or if there are any changes to be made to the account (mailing address, account name), please contact the Company's transfer agent, American Stock Transfer & Trust Company, at the following:

American Stock Transfer & Trust Company
c/o Vonage Holdings Corp.
59 Maiden Lane
Plaza Level
New York, NY 10038

Phone: (800) 937-5449 or (718) 921-8124 (for international callers)

Visit their website at www.amstock.com.

If you own stock through a brokerage account, contact your broker who is responsible for your account.

The CUSIP number for Vonage's common stock is 92886T 20 1.