Why does someone call me when my IPHONE 4 is in airplane mode? Why can't I get a text message from him calling me in airplane mode?

The flight mode is to turn off the telephone communication function, that is, you can't answer the phone and send text messages, and there is no signal contact with the base station. Don't try to contact the base station.

Because cell phone signals will interfere with the electronic equipment on the plane, it is not allowed to turn on the cell phone on the plane. In this mode, the related functions of mobile phone signal are turned off, and the mobile phone can continue to use other functions, such as checking the phone book and enjoying articles and movies on the mobile phone.

So it's called flight mode.

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So turning on flight mode is equivalent to turning off your mobile phone, and you can't talk or send or receive text messages.