Hi my name is Gedisa I would like to know how to hack ethio telecom mobile card

A telephone card, calling card or phonecard for short, is a credit card size plastic or paper card, used to pay for telephone services (often international or long distance calling). It is not necessary to have the physical card except with a stored-value system; knowledge of the access telephone number to dial and the PIN is sufficient. Standard cards which can be purchased and used without any sort of account facility give a fixed amount of credit and are discarded when used up; rechargeable cards can be topped up, or collect payment in arrears. The system for payment and the way in which the card is used to place a telephone call vary from card to card.