The folks at Vonage have stepped to challenge the folks at Skype and Tango with a new Vonage Mobile app for iOS and Android that promises free app-to-app calls, free text messaging, and 30-percent cheaper VoIP than Skype. Also using the Vonage Mobile app you will save 70-percent less than “major mobile carriers” the company claims, with in-app payments via the Android Market and iTunes account.

Users can add calling credits in top-up increments of $4.99 and $9.99 and if your friends and family use Vonage VoIP accounts for their home or business line then you might not need to bother spending a dime. Calls to those numbers are also free and you don’t need to be a Vonage subscriber to use the new mobile app.Vonage users can view their existing credit and look up international rates in the app before making a call which this eliminates the need for credit cards, PIN entries and the need to leave the app when the user wants to make a call. Another cool feature is that your existing mobile number shows on Caller ID, so there is no need to create and share a new username, and friends and family can know who is calling.
Vonage Mobile doesn't limit calls to people with the app, or even to people who have a smartphone. You can call direct from Vonage Mobile to virtually any phone number on the planet. You can dial internationally without needing to activate special services with your mobile carrier. And most importantly, you can do this with the address book on your phone and your existing mobile number.
For more information on Vonage Mobile app, which works on the iPhone and Android smartphones along with the iPad and iPod touch and Android tablets, head here.
Note: for a limited time calls to any phone in the United States, Canada or Puerto Rico** from anywhere in the world will be FREE!!!