HTC 2 user manual Turning the Phone Function On and Off, To enable or disable the phone function

40  Using Phone Features

Phone Services	Usage
TTY Mode	Allow the use of a TTY (teletypewriter) device with the device for users who are visually or
	hearing impaired.
Time Synchronization	Choose whether or not to synchronize the time on your device with the mobile network.

2.10  Turning the Phone Function On and Off

In many countries, you are required by law to turn off the phone while on board an aircraft.

To enable or disable the phone function

1.Tap Start > Settings, and then tap Communications.

2.Tap the OFF/ON slider at the right side of the Phone option to enable or disable the phone function.

To enable or disable Airplane Mode

Another way to turn off the phone function is to switch your device to Airplane Mode. When you enable Airplane Mode, all wireless radios on your device are turned off, including the phone function, Bluetooth, and Wi-Fi.

1.Tap Start > Settings, and then tap Communications

2.Tap Airplane Mode to enable or disable Airplane Mode.

When you disable Airplane Mode, the phone function is turned back on and the previous state of Bluetooth and Wi-Fi are restored.