Vonage today launched new versions of their mobile app for both iOS and Android phones that feature free app-to-app calling and international calling rates that on average are 70 percent less than major mobile carriers and 30 percent less than Skype according to their release notes on iTunes. What's nice about their mobile app is it lets you talk and text worldwide for FREE with anyone else who has the app. It's also wideband HD audio for better audio quality.
Another nice feature is that you simply use your existing address book and there is no need to leave the app. It works on both Wi-Fi and 3G/4G. Importantly, it uses your mobile number as your caller ID, which is another value-add that not all mobile VoIP apps provide. It also offers easy in-app purchasing through your iTunes or Android Market account to charge-up our account.
Another nifty feature is that you can check the calling rates for any number in your address book directly within the app. No need to launch your mobile browser and look up the calling rate. Here's a screenshot of this in action:
Here's a screenshot showing your contacts with a Vonage "V" logo next to contacts that are a free phone call, with the ability to invite others as well:
You do not need to be a Vonage phone service customer to use the app. However, as an added benefit to all app users, calls to any Vonage number are also free. To encourage usage of this new app for a limited time any phone number in the United States, Canada or Puerto Rico from will be free. Sweet! 
Via The Verge
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