Do you really know? What’s the point of flight mode?
Feb 27, 2026
A quick look at what flight mode actually does and which radios it turns off. A discussion of why airlines ask passengers to switch it on and potential risks to aircraft systems. A brief review of WHO findings on radiofrequency health concerns. Practical perks like battery savings, fewer distractions, and small environmental benefits.
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What Flight Mode Actually Disables
- Flight mode primarily disables the cellular radio, cutting voice calls, texts, and 4G/5G connections.
- Wi‑Fi and Bluetooth are also turned off by default as a precaution but can be reenabled manually when safe.
Why Airlines Require Flight Mode
- Flight mode on planes prevents interference between passenger devices and aircraft radio systems used for navigation and comms.
- Simultaneous connections to ground towers from many airborne phones could overwhelm terrestrial networks and disrupt avionics near airports.
5G Frequency Overlap Raises Concerns
- 5G uses frequencies near bands reserved for aviation, raising potential interference risks during critical phases like landing.
- That proximity of frequencies makes regulators and airlines particularly cautious around airports.