One or more features of a tracking device can be disabled if the tracking device is lost. A tracking device is associated with a first mobile device, which can remotely control the tracking device via a tracking server. The tracking server receives an instruction from the first mobile device to disable a feature of the tracking device. The tracking server also receives a notification from a second mobile device that the second mobile device is within a communication range of the tracking device. In response to receiving the instruction and the notification, the tracking server transmits the instruction for the tracking device to disable the feature to the second mobile device. The tracking device receives the instruction to disable the feature from the second mobile device. In response to receiving the instruction to disable the feature, the tracking device disables the feature according to the instruction.