Haier U50 User Manual - Page 26
Keyboard lock
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Sound recorder Record the call. Background sound Press this key in this state to open or close background sound. Mute Open or close Mute. DTMF Open or close DTMF. Note: Menu items marked with * appear in specific conditions only. For example, "Switch" appears only when calls in talk state and hold state exist at the same time. Besides, multi-party talk function should be applied from network service operator. 3.7 Keyboard lock You can select time for automatic keyboard lock via [Settings][Security settings][Auto keypad lock], so that your cell phone can automatically locks the keyboard. You can also press [soft key] and then [send key] to lock keyboard in standby state. Once keyboard is locked, you can press [send key] according to directions on 20