What is a callback?
Application sends a request for a call and the system will automatically call you in a few seconds, then you are connected to the requested number.
The call request is sent over the internet(few Kb) and works fine with FUP applied. The call is connected through the mobile network.
To use the service you must have an account on voocall.cz: https://www.voocall.cz/registrace
Calls are charged at the service voocall. You pay nothing to your operator. This service can be used by anyone with any mobile phone and any operator. The phone does not need to adjust anything.
The service can be used anywhere, anytime. Is particularly advantageous for owners of all prepaid operators as call price is based on the Czech mobile phone via callback at only 1.1 CZK incl VAT per minute and is charged each 1s. Which is considerably less than what mobile operators charge for calls with prepaid cards or the commercially available tariffs. When using the Callback service it is important to realize the price consist of the price of an incoming call to a mobile phone (0.55 CZK including VAT) + price of the call to the called destination according to the price list: http://www.voocall.cz/coajak_cenik.html
Another interesting use of services voocall Callback for calls abroad or to foreign countries. You can still achieve much higher savings. For example, a call to Germany or the USA will cost less than a call to the Czech mobile.
More information: http://www.voocall.cz/