| 摘要 |
An extra radio receiver circuit in the phone can activate the ring tone for the phone, even if it is switched off, when a coded signal is received from a tracking device. DETAILED DESCRIPTION - A mobile telecommunications device (13), e.g. mobile phone, contains a first radio receiver circuit, and a ring mechanism for activating the ring tone when a call is received, in addition to a second radio receiver circuit and components for activating the ring mechanism when a coded signal is received by the second circuit, irrespective of whether the phone is turned on or off. An INDEPENDENT CLAIM is also included for the tracking system (10), including a portable tracking device (11) that contains a radio transmitter for sending the coded signal to the above mobile phone. |
