A method of operating a terminal device to communicate with a network infrastructure equipment in a wireless telecommunications system using radio resources comprising a narrowband carrier supported within a wider system frequency bandwidth of the wireless telecommunications system, wherein the method comprises: establishing initial frequencies for radio resources comprising the narrowband carrier; receiving configuration signalling from the network infrastructure equipment providing an indication of a frequency shift to apply to the initial frequencies for the radio resources comprising the narrowband carrier; establishing shifted frequencies for the radio resources comprising the narrowband carrier by applying the indicated frequency shift to the initial frequencies; and communicating with the network infrastructure equipment using the radio resources for the narrowband carrier with the shifted frequencies.