Airplane mode is a device setting that turns off cellular connectivity and changes other wireless functions according to the device. It is useful during a flight, but it is not a promise that every transmitter or feature on every phone behaves identically. Your airline and crew provide the instructions that apply aboard the aircraft.
Follow the airline's device instructions
The FAA’s passenger guidance says cellular service must be turned off during flight and devices may use available onboard Wi-Fi when the airline permits it. Some airlines also allow Bluetooth accessories. Check the instructions for your flight and device instead of assuming the settings you used on another airline apply.
Switching airplane mode on does not prevent you from using downloaded material. Books, music, saved documents and suitable games can remain available offline. Services that need an internet connection may stop working until an approved connection is available.
Prepare useful information before boarding
Download entertainment, your arrival plans and any information you may need without a connection. Confirm that a download actually opens offline: an app can show a title or thumbnail without storing the full item. Keep a suitable backup of essential travel details in case a phone runs out of power.
Charge the device before leaving, and bring the correct cable if you intend to use an available charging outlet. Aircraft power and onboard internet are not guaranteed on every flight. Check the airline’s equipment information while recognizing that an aircraft substitution can change what is available.
Make the cabin experience easier
Use headphones and a considerate volume, keep the aisle clear, and stow larger devices when the crew directs. Pay attention to safety instructions even if entertainment is already playing. Airplane mode can also make it easier to take a break from notifications, but whether a flight feels relaxing depends on the person and the circumstances.
A few minutes of preparation on the ground can prevent an avoidable problem in the air: unavailable downloads, a flat battery or missing arrival details.