Factory data reset
Settings > Backup & reset > Factory data reset > Reset phone > Type 4 numbers after "Please type" > Erase everything
Read carefully before install new Apps
Do not click to choice "Use your Google Account to backup ..." and "Keep me up to date..."
Note whenever enable location
Add ringtone to SMS
Boost your battery
Do not use much widgets
Settings > Lock screen > Off Quick access, what's next widget, instant camera
Vibrate only, do not use ringtone
Turn on "Ultra-saving mode"
Power management > Power saver > On "Ultra-saving mode"
Decrease your sleep time
Settings > Display > Sleep > 30s
Do not show battery percentage
Settings > Battery > Show battery percentage
Use default language only
Disable the SIM that you do not use
Do not sync data
Enable Developer options
Settings > About > Software information > Build number > Click 7 times
Safety remove your card
TIP1: You can Enable Airplane mode to charge your battery faster.
TIP2: If you Turn on Airplane mode, you can play game without ADs.
Use Calculator to Test your Mobile hardware
Open Calculator, press .12345 + = ( with Zenfone )