iTalkWorld App uses SIP technology.

This app give you FREE premium quality calls to other iTalkworld users and lowest Rate calls to regular phone numbers anywhere in world using 3G , Wifi or any hi speed Internet connectivity.
You can Call any regular number anywhere in World at LOWEST per Minute Rate , or you could also opt in for any of Talk Plans.
Call Free to other iTalkWorld users on iPhone,iPad, iPod Touch , Windows PC , MAC user .. other soming soon

You Could also get a DID ( Direct Inward Dialing ) number from list of countries and receive unlimited incoming calls for free on iTalkWorld App .
You Could get Email Signature , thereby users anywhere in world can call you directly at click of button for Free.
Cheap Calls: The iTalkWorld dialer lets you make cheap calls to international destinations. It is the best IOS voip solution; save on your mobile phone costs right away, by using this iTalkWorld cheap calls app!
Travel Roam free with iTalkWorld ! You never have to worry about high roaming costs abroad anymore! When abroad, simply use iTalkWorld over a WiFi network or Bundled Data Plan ! Whether in a restaurant, hotel room or public HotSpot, you can now save on mobile calling charges when traveling abroad as well!

- Make Lowest Rate international calls over SIP technology with this iTalkWorld dialer
- Use your own contacts from within the free calls app
- Connect to Internet using 3G, 4G WiFi, UMTS and use your Calls credit on the go for cheap calls.
- Enjoy the cheapest international calls to any other destination.
- Cheaper than Skype! More possibilities than Viber! No one offers cheaper calls!
- Free ITalkWorld Inum Number