A terminal device comprising: transmitter circuitry configured to transmit a signal to infrastructure equipment of a wireless telecommunications network using a predetermined set of radio resources configured for use by a plurality of unidentified terminal devices; receiver circuitry configured to receive, from the infrastructure equipment, at least one of: a positive response signal indicating that the signal transmitted to the infrastructure equipment was successfully received by the infrastructure equipment and that the identifying feature of the terminal device was successfully determined by the infrastructure equipment using the signal transmitted to the infrastructure equipment; and a negative response signal indicating that the signal transmitted to the infrastructure equipment was not successfully received by the infrastructure equipment or that the identifying feature of the terminal device was not successfully determined by the infrastructure equipment using the signal transmitted to the infrastructure equipment.