A terminal device for use with a wireless telecommunications network, the terminal device comprising: storage configured to store ancillary information not essential to every connection between the terminal device and the wireless telecommunications network; a controller configured to produce data indicative of the stored ancillary information; a transmitter configured to transmit the produced data to the wireless telecommunication network; and a receiver configured to receive an indication from the wireless telecommunication network to transmit the ancillary information to the wireless telecommunication network, wherein in response to the indication, the transmitter is configured to transmit the ancillary information.