Huawei U3900 - Security Settings; Master reset; Master clear

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Settings Description Menu selection
PIN
Verification
Enable or disable PIN
verification.
Menu > Settings >
Security > PIN
Verification
Master
reset
Restore your phone to its
default settings.
Menu > Settings >
Security > Master
Reset
Master
clear
Restore your phone to
default settings, and clear
your personal data.
Menu > Settings >
Security > Master
Clear
Clear
temporary
data
When the memory is
insufficient, clear the
following temporary data:
web pages, messages, and
temporarily downloaded
files.
Menu > Settings >
Security > Clear
Temporary Data