User's Manual

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In general situation, it is identical with the left soft key.
8. Alphanumeric keys: These keys are used to dial and input
text in edit interface. Long press [2-9]: to call the contact
specified in the [Phonebook/Phonebook settings/Speed dial].
9. * key and # key: In idle mode, long press the # key to lock
or unlock the keypad. Long press the * key to activate or
deactivate the silent mode.
These keys have different functions at the different state or in
the different functions interface.