To text while flying, you'll need to use a messaging app like WhatsApp, Apple iMessage, WeChat or Facebook Messenger. These Over The Top applications don't require a cellular network connection and instead send messages through the internet.
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Most airlines will allow you to use your mobile phone in airplane mode once the aircraft reaches a safe altitude. Airplane mode disables the cellular, Wi-Fi, and Bluetooth functionalities of your device, ensuring it does not interfere with the aircraft's communication and navigation systems.
You can listen to downloaded music, play games, write notes, view pictures, and do any other activities on your mobile device as long as they do not require an internet connection. An internet or cellular connection is only required for in-flight calls, video calls, online games, streaming, and text messaging.
The ban over the use of electronic devices in-flight has often been attributed to the possibility of electronic interference with flight equipment in the modern an era of fly-by-wire planes, which control flight systems using electronic signals rather than physical movement of connect cables.