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Does Your Phone Really Need Flight Mode?

2 min read

The short answer

Flight mode is a sensible precaution, not a sign that one phone could endanger the plane. Airliners are tested to cope with signals from passengers' devices. The rule mainly prevents a faint buzz in pilots' headsets and protects mobile networks on the ground.

Why the Rule Exists

With hundreds of phones on board searching for a signal, the cabin fills with radio noise. Usually, nothing at all happens. Occasionally, pilots hear a faint "dit-dit-dit" buzz in their headsets. It's the same buzz you sometimes hear when a phone sits next to a speaker.

It's an annoyance, not a danger. But pilots prefer clear radio calls, especially during take-off and landing.

There's a second reason. A phone high in the sky can reach many mobile masts at once, which can cause problems for networks on the ground. In the US, that's why the communications regulator — not the aviation regulator — bans phone calls in flight.

Planes Are Built for It

In 2013, after an expert review, the US aviation regulator (the FAA) concluded that most airliners can tolerate radio signals from passengers' devices. Since then, airlines have let passengers use phones and tablets in flight mode from gate to gate. Europe made the same change a few weeks later.

In 2022, the European Commission went further. It cleared the way for airlines to offer 5G mobile service on board, using special equipment in the cabin.

What If Someone Forgets?

On almost every flight, someone forgets to switch their phone to flight mode. Planes are designed with this in mind. A forgotten phone won't put the flight at risk — at most, it adds a little radio noise.

In very low visibility, a few landing systems haven't been fully tested for interference. On those rare occasions, the crew may ask everyone to switch devices off completely. It's an extra precaution, not a warning.

What to Do

  • Switch to flight mode when the crew ask. It's quick and polite.
  • Wi-Fi and Bluetooth are often allowed — listen for the announcement.
  • Download films and podcasts before you fly.
  • If someone else's phone rings, there's no need to worry.

Sources

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