Tariff – a set of prices to use a sort of services of the GSM operator. There are two main types of tariffs. The first one is local tariffs. They include prices for mobile communications within a single state.
The second type is international. International tariff plan is also a set of prices for the use of mobile operator (calls, SMS, internet access) but beyond a single state. It is generally higher than local tariff.
International tariff plan is crucially important for GSM termination profit.