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In this paper1, we deal with the problem of GSM vulnerabilities to jamming attacks. We pick over the GSM standard to identify smart jamming strategies that can inhibit communications of GSM users, while preserving the energy of the jammer device. In particular, the identified jamming algorithm is focused on the control channels. We evaluate by system simulations the GSM robustness against the analyzed attacks. Obtained results show that the GSM security can be undermined by hampering the synchronization procedures. [ABSTRACT FROM PUBLISHER]