A method of operating a communications device (UE) in a mobile communications network including one or more network elements (eNodeB, MME; CIoT-BS, C-SGN) for providing a wireless access interface for the communications device (UE), especially according to LTE or CIoT, whereby the communications device (UE) transmits radio related capabilities of the communications device (UE) to a network element (eNodeB; CIoT-BS) of the mobile communications network providing a wireless access interface for the communications device (UE), the capabilities including information about single tone or multi tone as layer 1 techniques to be used. A method of operating a network element (eNodeB; CIoT-BS) in a mobile communications network including one or more network elements (eNodeB, MME; CIoT-BS, C-SGN) for providing a wireless access interface for the communications device (UE), especially according to LTE or CIoT, whereby the network element (eNodeB; CIoT-BS) of the mobile communications network providing a wireless access interface for the communications device (UE) and receives radio related capabilities of the communications device (UE) and whereby the network element (eNodeB; CIoT-BS) of the mobile communications network is able to use the received information regarding radio related capabilities of the communications device (UE) for selecting a core network node (MME; C-SGN) of the mobile communications network, the capabilities including information about single tone or multi tone as layer 1 techniques to be used. Mobile communications system for operating a communications device (UE) in a mobile communications network including one or more network elements (eNodeB, MME; CIoT-BS, C-SGN), which are especially for providing a wireless access interface for the communications device (UE), especially according to LTE or CIoT, whereby the communications device (UE) and a network element (eNodeB; CIoT-BS) of the mobile communications network providing a wireless access interface for the communications device (UE) are adapted to perform the steps of a method according to the present invention.