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remember and harder for others to guess. 
1. Press Home Key > tap   > Settings > Security > Set up SIM card 
lock. 
2.  Choose the SIM card you want set. 
3.  Make sure you already tick the Lock SIM card check box. 
4. Tap Change SIM PIN. 
Managing Your Device Memory 
Press Home Key > tap   > Settings > Storage. 
You can view the space information of the SD card and the internal storage.   
  Unmount SD card: You can unmount the SD card to safely remove it. 
  Erase SD card: Erase all data on the SD card. 
Time Switch Machine 
Press Home Key > tap   > Settings >Time Switch Machine 
You can control the mobile phone startup and shutdown by setting the power 
switch on and off time 
Personal: Reset to Factory Settings 
Press Home Key > tap   > Settings > Factory data reset > Factory data 
reset > RESET PHONE > ERASE EVERYTHING. 
WARNING: All your personal information and downloaded applications on 
your phone will be erased after the resetting. 
Applications 
See apps installed on your phone and manage them.   
Press Home Key > tap   > Settings > Apps. 
Touch an app in the Downloaded, Running, or All tab to see its information. 
You can stop the app, uninstall the app, clear data and cache, or move the 
app between the internal storage and the memory card. 
NOTE: Not all applications can be moved or uninstalled. 
Managing Other Settings 
Text-to-speech Output 
You can set the text-to-speech and voice recognition options by pressing 
Home Key > tap   > Settings> Language & input > Text-to-speech