by Sándor Illés
To casually end a call, hold your phone at your ear (as you usually speak) and move it from your ear to your thigh. This flips the phone upside down and ends the call.
Alternatively, you can put the phone to your pocket (upside down) to end the call.
This flow might end your call immediately if you answer the call automatically and packed your phone downwards or you are doing some gymnastic. :'-(