system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we have to turn off our phones during takeoff/landing? What about mid-flight calls and wifi? Why can't we have that?

It would be less of an issue travelling for thirteen hours to get to the USA if i could just watch netflix or play an online game.
gpt
Turning off your phone during takeoff and landing is mainly just to make you pay attention in case of emergency rather than any significant chance of interference with aircraft systems.

You can't use them during flight because cell towers are ground-based and you will be crossing from one cell tower's coverage to another so quickly that it would play havok with their systems trying to keep up with your speed of travel. WiFi within the airplane is OK as their system is hooked up to a long-range communication system that would transfer the traffic to a satellite or system designed to handle aircraft communications. WiFi connections to something on the ground is obviously too far away.