The initial time budget is indicated at the lower right corner of the front face of the card. The duration of the calls automatically monitored and computated.
Warning message is given when the time in the card is about to run out.
The overall call duration of the card varies in accordance with the tariffs of the country with which the call is made. Charging of call starts when the call is successfully placed. The countries are placed in 4 categories as indicated in the Tariffs Table. This tariff matrix gives the required units for one minute call according to the origin and the destination of a call.