Airplane mode is a great feature, which prevents iPhone from sending or receiving calls or messages. it is commonly known as Offline Mode, Flight Mode, Standalone Mode. It is useful not only while some flight but also once you need to focus and you do not want any stimuli to distract you! It disables all voices, messages, and other signal-transmitting technologies such as Wi-Fi and Bluetooth, so you will be able to focus on your duties.
You've got two possibilities to activate this super feature. Come along with both of them and choose the one that suits you most.