Airplane mode, aeroplane mode, flight mode, offline mode, or standalone mode is a setting available on smartphones and other portable devices. When activated, this mode suspends the device’s radio-frequency (RF)signal transmission technologies (i.e., Bluetooth, telephony and Wi-Fi), effectively disabling all analog voice, and digital data services, when implemented correctly by the electronic device software author. When cellular phones became prevalent in the 1990s, some communication headsets of aircraft pilots would register an audible click when a cellular phone on the aircraft would transceive a signal. This clicking on the headsets became overwhelmingly distracting to airframe control, with more and more phone calls from airplane passengers as time went on. This led to the banning of electronic device use on airplanes and ushered in the era of airplane mode. This airplane travel condition diverged cellular network device development from hardware to software and the smart phone was created.
Wi-Fi and Bluetooth can be enabled separately while the device is in a pseudo-airplane mode, as allowed by the operator of the aircraft. Receiving RF signals (as by radio receivers and satellite navigation services) may not be inhibited by airplane mode; however, both transmitters and receivers are needed to receive calls and messages, even when not responding to them.
Known also as Air plane mode, this mode disables all radio parts of a mobile phone but leaves other functions available. These include music player, organizer and everything that doesn’t require the radio transmitters.
This mode is required because most airlines forbid the use of wireless devices during flight. Some airlines do not allow the use of such devices even in Airplane mode.
There is an industry standard icon to signify that airplane mode is on but not all phones use it.
This mode is required for several reasons. Preventing interference with the airplane equipment is the best known one but another reason is that cell towers cannot handle phones moving at high altitudes and speeds.