Vonage is allowing customers to extend their Vonage home calling plans to any phone, including mobiles. The move allows customers to use Vonage's signature unlimited international calling plans from their mobile phones to call friends and family abroad. The new service offering -- Extensions -- is free to all Vonage customers and builds upon Vonage's history of providing unsurpassed value to customers for both domestic and international calling.

Existing customers can add any U.S. phone number as an extension by logging into their online account at www.vonage.com. The extension phone number can be a cell phone, a home phone or even an office number. Once registered, the service works like a virtual calling card. Simply dial the access number and international destination number and the call is connected over the Vonage network.

Extensions works with any mobile phone, and in the next several weeks Vonage plans to offer downloadable apps for iPhone® and Android devices, enabling one-touch dialing directly from the customer's contact list.

Customers with the Vonage World plan will now have the additional flexibility of unlimited calling to more than 60 countries from their cell phones in addition to from their home phone. Those who call internationally for as little as an hour a week will save an average of $250 a year versus the best international rates from major wireless carriers.