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The nearly universal instruction to turn on **Airplane Mode** before takeoff and during flight is a mandatory safety rule enforced by regulators like **FAA**, **EASA**, and **IATA**—it’s not just a courtesy. This disables cellular, Wi-Fi (unless re-enabled for approved in-flight use), and Bluetooth transmissions to prevent potential electromagnetic interference (EMI) with aircraft systems.

Modern aircraft are well shielded against radio signals, and extensive studies (e.g., FAA 2012–2013 reviews, RTCA reports) have found no conclusive evidence that personal devices have caused navigation failures or accidents. However, the overall EMI from multiple active phones can cause problems—pilots sometimes report buzzing or static in the headset during critical phases (takeoff/landing), which can distract the crew when clear communication with air traffic control is critical. Aviation prefers “extreme caution”: even low probability risks are minimized.

One main practical reason: phones operating at altitude/high speed constantly scan and try to make connections to multiple distant ground towers, creating interference that degrades ground mobile networks and causes dropped calls for people on the ground. Airlines allow Wi-Fi (satellite-based) and Bluetooth to be reactivated after takeoff for approved in-flight entertainment or accessories. In-flight cellular (via picocell) is still prohibited in most locations (e.g., per US FAA/FCC regulations) due to ongoing concerns.

The crew usually gives a polite reminder if the rules are not followed. Repeated refusal may be regarded as non-compliance with legal safety instructions, which may lead to a warning, removal from future flights, or rare legal consequences after landing.

While a single phone may no longer jeopardize a flight in 2026, Airplane Mode is a simple, low-cost security measure to ensure communication clarity, network stability, and regulatory compliance – ensuring safety in an industry where zero risk is the goal.