Why do phones have airplane mode?
Show answer & explanation
Answer: Stops interference with aircraft
Saves battery during flights — Wrong. Airplane mode does save battery (cellular radios drain power searching for signals), but primary purpose is preventing interference with aircraft systems.
Prevents phone overheating — Wrong. Overheating isn't the concern. Airplane mode disables wireless transmissions that could potentially interfere with navigation and communication systems.
Stops interference with aircraft ✓ — Correct! Airplane mode disables cellular, Wi-Fi, and Bluetooth radios. Early concern was that phone signals (especially during takeoff/landing) could interfere with aircraft navigation and communication systems. Modern planes are better shielded, but regulations persist. Airplane mode prevents your phone from transmitting radio signals at frequencies that might cause interference. Airlines now allow Wi-Fi/Bluetooth once airborne!