Wrecking AT&T’s business model for the iPhone? There’s an app for that…
Lefar said Vonage was careful to follow all the application requirements set out by Apple and Rim.
Vonage users will even be able to make calls from iPhones using AT&T's cellular network as well as the device's short-range Wi-Fi links, found in places like coffee shops.
By comparison, usage of the iPhone app for Skype, the Internet telephone unit of eBay Inc, is limited to areas where Wi-Fi is available.
Vonage's iPhone customers, however, will use up minutes from their AT&T service plan whenever they make a call using the cellular network.
Lefar said consumers will still save a lot on international calls because they will pay Vonage's lower international rates rather than those of AT&T.