A system for determining the location of a device in a wireless communication network includes at least one antenna for transmitting signals in a wireless communication network. A temporary change in temperature is effected by dissipating the thermal energy through the moisture in the area surrounding the probe, this change in temperature being used for determining the moisture content of the medium. Each raised portion being moulded in the body to separate the outlet from the base of each reservoir to ensure a sufficient flow rate of fluid from the reservoir. A nozzle array 16 is mounted within the housing 4 for rotation about a longitudinal axis of the housing 4 and is coupled to a source of lubricant. The server then sends the selection to the network entity. A method for unlocking a mobile device including: receiving voice information from the mobile device; analyzing the voice information; determining if the analyzed voice information matches with a predetermined voice profile; and if there is a match, sending an unlock signal to the mobile device.