Vonage announces iPhone and Android apps that allow you to call and text message other Vonage Mobile app users for free, worldwide, on iPhone and Android. You can also call any phone number in over 200 different countries at discounted rates. You can even purchase calling credits through iTunes or Android market accounts.
Calls will work over WiFi, 3G and 4G. You do not have to be a current Vonage customer to use the apps and it uses your existing phone number and contacts list. The app supports notifications also.
The text messaging feature is easy to use and organizes texts by conversation. It even has a group and individual invite feature to invite others to connect with you via Vonage.
Rates are lower than Skype and can be purchased in $4.99 and $9.99 credit options through iTunes or the Android Market using your current account. Rates are very reasonable.
It's very easy to get started. Simply download the app and enter your mobile number and email address. Vonage will send you a free text message with a code to validate your phone number. Then you can start inviting others to do the same and call and text you for free.
If you call a number that is not Vonage mobile, the app will display the per minute rate for that call before you connect so you can decide whether or not to make the call or if you have enough credits.
This could be a good option for schools to use. Administrators, teachers, and others could use the app for free calling.
Here's a video that demo's the app:
Disclosure: I was paid to write this article, as well as for the ad on the top of this site.