In many countries, you are required by law to turn off wireless devices while on board an aircraft. A way to turn off wireless functions quickly is to switch HTC ChaCha to Airplane mode.
When you enable Airplane mode, all wireless radios on
HTC ChaCha are turned off, including the call function, data services, Bluetooth, and Wi-Fi.
When you disable Airplane mode, the call function is turned back on and the previous state of Bluetooth and Wi-Fi is restored.
To turn Airplane mode on or off, press and hold POWER, and then tap Airplane mode.
When enabled, the Airplane mode icon
is displayed in the status bar.