Calypso Applet: pure software independent of the hardware platform

The best evidence of the openness of Calypso may be seen in its software version, the Applet (or Cardlet) dedicated to be integrated on whatever Java Card platform (SIM for mobile phones, EMV card, etc.). This applet software is provided by CNA, free of charge, and can be used with whatever platform provided by manufacturers, provided that this platform strictly respects the relevant standards (particularly ISO 7816-4). By using the Calypso applet, the operator has totally a free choice of its provider.