SIM box
A SIM box (also called a SIM bank) is device used as part of a VoIP gateway installation. It contains a number of SIM cards, which are linked to the gateway but housed and stored separately from it. A SIM box can have SIM cards of different mobile operators installed, permitting it to operate with several GSM gateways located in different places.[citation needed]
Fraudulent usage and detection
The SIM box operator can route international calls through the VoIP connection and connect the call as local traffic, allowing the box's operator to bypass international rates to fraudulently undercut the prices charged by genuine mobile network operators.[1][2] They will also create disproportionately high traffic for local calls in the area, causing congestion that affects the network performance for genuine local traffic.[1]
One method of detecting this sort of fraudulent usage is to generate test traffic from known international locations.[3]
It is illegal in a number of countries, such as Ghana, to use a SIM box as a call termination device.[2][4]
References
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