Method of detecting by a communication user equipment (UE) a jamming transmitter affecting the communication user equipment (UE), wherein - said communication user equipment (UE) is adapted for communication with a component of a cellular radio network (RN) having a number of communication user equipments (UE) and a number of base stations (BNS) 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 (UE) in a start up mode for achieving a connected mode of a communication radiolink with the component of the radio network (RN), wherein in the start up mode of said communication user equipment (UE) 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 (UE); - receiving a coverage information of deployment of radio network (RN) at the position; - indicating for the communication user equipment (UE) a jamming transmitter (J) in case said coverage information indicate that at the position of the communication user equipment (UE) the radio network (RN) is deployed. - said communication user equipment (UE) is adapted for communication with a component of a cellular radio network (RN) having a number of communication user equipments (UE) and a number of base stations (BNS) 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 (UE) in a start up mode for achieving a connected mode of a communication radiolink with the component of the radio network (RN), wherein in the start up mode of said communication user equipment (UE) 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 (UE); - receiving a coverage information of deployment of radio network (RN) at the position; - indicating for the communication user equipment (UE) a jamming transmitter (J) in case said coverage information indicate that at the position of the communication user equipment (UE) the radio network (RN) 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 (UE); - receiving a coverage information of deployment of radio network (RN) at the position; - indicating for the communication user equipment (UE) a jamming transmitter (J) in case said coverage information indicate that at the position of the communication user equipment (UE) the radio network (RN) is deployed. <EOS>