Page 2 of 2GSM gateway or SIM box fraudSIM box fraud occurs when the cost of terminating national or international calls exceeds the cost of a local mobile to mobile call in a particular country. Individuals and organisations buy multiple SIM cards and sell capacity to terminate calls on the open market. This leads to lost revenues for mobile network operators. SIM box fraud is illegal since those who undertake it are not licensed to provide telecommunications services in the country. Consumers will be unaware that their call is being routed via a SIM box but may experience a reduced quality of call or a reduction in telecommunications services, such as caller line identity.
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