Method of detecting by a communication user equipment a jamming transmitter affecting the communication user equipment, wherein - said communication user equipment is adapted for communication with a component of a cellular radio network having a number of communication user equipments and a number of base stations for communication in a communication band on a communication channel of a predetermined frequency range, and wherein the method comprises the following steps: - providing the communication user equipment in a start up mode for achieving a connected mode of a communication radiolink with the component of the radio network, wherein in the start up mode of said communication user equipment it is determined that a connected mode of the communication radiolink cannot be established, and wherein the steps are provided: - measuring a power level in the radiolink at least at the predetermined frequency range and determining whether the power level is above a threshold level which is considered sufficient to establish a communication link; - receiving a location information with regard to a position of the communication user equipment; - receiving a coverage information of deployment of radio network at the position; - indicating for the communication user equipment a jamming transmitter in case said coverage information indicate that at the position of the communication user equipment the radio network is deployed. - said communication user equipment is adapted for communication with a component of a cellular radio network having a number of communication user equipments and a number of base stations for communication in a communication band on a communication channel of a predetermined frequency range, and wherein the method comprises the following steps: - providing the communication user equipment in a start up mode for achieving a connected mode of a communication radiolink with the component of the radio network, wherein in the start up mode of said communication user equipment it is determined that a connected mode of the communication radiolink cannot be established, and wherein the steps are provided: - measuring a power level in the radiolink at least at the predetermined frequency range and determining whether the power level is above a threshold level which is considered sufficient to establish a communication link; - receiving a location information with regard to a position of the communication user equipment; - receiving a coverage information of deployment of radio network at the position; - indicating for the communication user equipment a jamming transmitter in case said coverage information indicate that at the position of the communication user equipment the radio network is deployed. - measuring a power level in the radiolink at least at the predetermined frequency range and determining whether the power level is above a threshold level which is considered sufficient to establish a communication link; - receiving a location information with regard to a position of the communication user equipment; - receiving a coverage information of deployment of radio network at the position; - indicating for the communication user equipment a jamming transmitter in case said coverage information indicate that at the position of the communication user equipment the radio network is deployed.