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Airplane mode (also known as 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.[citation needed] 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.

The mode is so named because most airlines prohibit the use of equipment that transmit RF signals while in flight. Typically, it is not possible to make phone calls or send messages in airplane mode, but some smartphones allow calls to emergency services. Most devices allow continued use of email clients and other mobile apps to write text or email messages. Messages are stored in memory to transmit later, once airplane mode is disabled.

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.[1][2] 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.

Since a device's transmitters are shut down when in airplane mode, the mode reduces power consumption and increases battery life.




References


  1. "iOS: Understanding airplane mode". Apple Support. April 14, 2015. If allowed by the aircraft operator and applicable laws and regulations, you can re-enable Wi-Fi and Bluetooth while in airplane mode
  2. "Android: AIRPLANE_MODE_RADIOS". A comma separated list of radios that need to be disabled when airplane mode is on. This overrides WIFI_ON and BLUETOOTH_ON, if Wi-Fi and Bluetooth are included in the comma separated list.
  3. "China's air passengers could soon be allowed to use smartphones". scmp.com.
  4. Attwooll, Jolyon (February 5, 2016). "Regulator confirms tablets safe to use during take-off" via www.telegraph.co.uk.
  5. "DGCA allows in-flight use of mobile phones, tablets on flight mode". indianexpress.com. April 23, 2014.
  6. "FAA to Allow Airlines to Expand Use of Personal Electronics". Federal Aviation Administration. October 31, 2014. Cell phones should be in airplane mode or with cellular service disabled—i.e., no signal bars displayed—and cannot be used for voice communications based on FCC regulations that prohibit any airborne calls using cell phones. If your air carrier provides Wi-Fi service during flight, you may use those services. You can also continue to use short-range Bluetooth accessories, like wireless keyboards. [...] The PED Aviation Rulemaking Committee (ARC) concluded most commercial airplanes can tolerate radio interference signals from PEDs. In a recent report, they recommended that the FAA provide airlines with new procedures to assess if their airplanes can tolerate radio interference from PEDs. Once an airline verifies the tolerance of its fleet, it can allow passengers to use handheld, lightweight electronic devices—such as tablets, e-readers, and smartphones—at all altitudes





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