Been using this for a few days now and works like well " a walkie talkie " lol
TiKL – Touch to Talk, developed by TiKL Inc, is now available from the App Store and has made Apple’s Top 300 iPad/iPod applications list. The app was last released on October 18, 2010 and sells for Free.
The application developer’s description of the application is, “Instantly talk to one or many phone contacts or Facebook friends at once with the touch of a button. No more waiting for the phone to ring. Simple and free, TiKL turns your iPhone/iPod Touch into the ultimate Push To Talk (PTT) real-time Walkie Talki
*Supports both phone contacts and facebook friends.
* No voice plan or SMS used for TiKL calls.
* Works across multiple smart phone platforms.
* Works over WiFi, 3G, EDGE and GPRS.
* Requires iOS4 or higher.
TiKL - Touch to Talk for iPhone, iPod touch, and iPad on the iTunes App Store