Every time we get on a plane, we're asked to either turn off our phones or change them to a flight mode-it's for "safety reasons". But according to The Conversation website, having to turn our phones off on a plane is "a service problem, not a safety one".
When we speak on our phones in the air, they can cause influence to the plane's radios. Pilots can hear this influence in their headphones. "It's the same noise you often hear in your daily life, if you put your phone too close to a speaker," the Mirror noted. "It is not safety critical, but can make people uncomfortable for sure." Though speaking on a phone during a flight isn't dangerous, it is still not a good idea.
When we make or receive a call on the ground, we connect to cell tower that deals with all calls within an 80-kilometer radius（半径）. As we move from place to place we are "handed on" to different cell towers.
Now things are beginning to change. If we still can't speak during a flight, we can use other tools. For example, Airbus A330 of Emirates Airlines has WiFi to make passengers send and receive short messages in the air.
The great development could be "pico cells", which are small cell towers on the plane itself. There would no longer be connections made between phones and the ground. We soon will be able to talk on the phone in the air in the future. Let's wait for it together!
