what is aeroplane mode

Airplane mode, also known as aeroplane mode, flight mode, offline mode, or standalone mode, is a setting available on smartphones and other portable devices. When activated, this mode suspends the devices radio-frequency (RF) signal transmission technologies, effectively disabling all analog voice and digital data services. The mode is so named because most airlines prohibit the use of equipment that transmits RF signals while in flight. Typically, it is not possible to make phone calls or send messages in airplane mode, but some smartphones allow calls to emergency services. Most devices allow continued use of email clients and other mobile apps to write text or email messages. Messages are stored in memory to transmit later, once airplane mode is disabled. Wi-Fi and Bluetooth can be enabled separately while the device is in a pseudo-airplane mode, as allowed by the airline.