Telephone cards with which help it is possible to call abroad, have different face value - from 3 to 150 conditional telephone units, each of which is equal to dollar. Thus period of validity of the majority of maps from the moment of activation is not limited, and by the same card it is possible to call some times, not being limited to certain time frameworks.
The technics of management of a map is simple - has erased a pin-code hidden under a protective layer, and, following the instructions written on a map, and also vocal instructions in different languages, call where you want.
However if to use "automatic" way it is impossible (we will tell, if at the person phone in style "retro", that is there is no voice-frequency set), to call it is possible through the operator - its phone as well as number of a technical support service, is specified on a card.