If you’ve ever been a blackberry user, you’ll get the gist of this immediately, think Blackberry Messenger but for the iPhone.
Once you’ve started a conversation, the application works just like the SMS client except it’s free, instant and works internationally at no extra cost (aside from your international roaming costs that is). Whenever you receive a message you’ll receive a push notification and you can respond just as you would with SMS.
The UI is clean and simple, there are a few odd bugs here and there but it is the very first release so expect them to be cleared up soon.
Source:
http://thenextweb.com/2009/09/29/pin...-iphone-users/
Great news! Finally a competition for Blackberry Messenger! In my country almost anyone has an iPhone so guys feel free to add me, my pin ID is alejandrohernandez. It also has push notifications! you can download it for free from the app store