S3Phone - free & lowcost phone calls for iOS

S3 World Phone is the next generation phone application for your Iphone.Now you can call and text any national, international, landline or mobile phone in the world, even without internet access!You can also use S3 World Phone while abroad, thus saving up to 90% on Roaming fees!S3 World Phone gives you free domestic and long distance calls to more than 35 countries (including USA, Mexico, Europe, China, Brazil, etc.), and the cheapest possible rates to the remaining ones! More info at www.s3phone.comThis app will allow you to call using: - VOIP: if you have 3G or broadband internet, this allows you to make the cheapest calls - Callback via net: even with a bad internet connection, we can start your call! - Callback via text/sms: no internet? don't worry! your call can be activated just by sending a text message to our server! - Virtual Number: we provide you with local numbers from USA, UK and PT; just use them to call your friends and family abroad.Additionally, you can also send low-cost text messages (SMS) to any mobile phone in the world.======Technical details - How it works======:VOIP: "Voice over IP", allowing the cheapest rates. Just make sure you have enough broadband (3G, 3.5G, 4G or Wifi)CALLBACK: By sending a request to our server, your phone will start ringing. Just pick it up and wait for your destination to answer.VIRTUAL NUMBER: your mobile network probably gives you free or cheapest calls to specific networks or landlines. S3Phone will call one of those numbers and then automatically pass the call to your final destination.