Unlike other mobile operators who use multiple and complex criteria charges for each roaming call , eg geographic location, ISP, called number, etc, the PlanetSim  charges with a single and simple criterion: the location of Sim. This means the country where you are at the time you receive or do  a call. For example if the PlanetSim user is in Italy will receive incoming calls from anywhere free of charge and will be charged with 0,48 € / minute for outgoing calls to anywhere except  towards special call destinations.