Andy Gent is categorical. Between 12 and 13 August 2015, Revector, his company specialised in detecting GSM frauds throughout the world, made a thousand test-calls in Cameroon. "700 calls were made with sim cards from operators Orange and MTN. 65% of these calls were done illegally", he confided to the private Cameroonian daily Mutations, which reported the conclusions of a forum on frauds through the SIM toolbox (Sim Box), recently organised in Yaoundé on the initiative of Muna Governance and Economics Forum (MUGEF).

According to the explanations of Akéré Muna, a famous Cameroonian lawyer, "the Sim Box is a device holding many sim cards and making it seems as if calls coming from abroad are emitted from Cameroon". Therefore, continues the lawyer, the fraudster who uses it can avoid international tariffs and the associated taxes, which results in losses running up to billions of FCfa for the operators and public authorities. For example, Andy Gent revealed, in 2013, "funds embezzled add up to USD 2.63 billion (over FCfa 100 billion)" at the global level.

In addition to the important financial losses, Sim Box frauds are at the root of the congestion sometimes observed on the telephone network, background noise, failure of calls emitted, long delays observed when trying to get in communication. Against this worrying situation, the Minister of Posts and Telecommunications Jean-Pierre Biyiti bi Essam, assured that the government is currently thinking about putting in place technical solutions to avoid these frauds.