How to cancel an incoming call on samsung flip mobile , since on opening itself the call get connected?

Answer 1

Press END
You can check the disply before you open it on some models so you can tell who it is and if you don't want to talk to them just don't open it.

Answer 2

Your phone is currently programmed to accept calls when opened, like picking up a receiver. Change the parameters of how you accept calls with your flip phone through your call options. You will be able to disable that option.