Factory data reset
Erase all of your personal data from internal phone storage, including information about your Google Account, any other accounts, your system and application settings, and any downloaded applications. You can also mark the Erase SD card check box to erase all the data on your microSD card, such as music or photos. If you reset the phone in this way, you’re prompted to
When you are unable to power on your phone, there is another way to perform a factory data reset by using hardware keys. Hold down 
key and press Power key at same time until the screen lights up.
12.11SD card & phone storage
Use the microSD card & Phone Storage settings to monitor the total and available space on your phone and on your microSD card; to manage your microSD card; and if necessary, to reset the phone, erasing all of your personal information.
12.11.1SD card
Total space/Available space
Lists the amount of space on any microSD card installed in your phone and the amount you can use to store photos, videos, music, and other files.
Unmount SD card
Unmounts the microSD card from your phone so that you can format the card or safely remove it when the phone is on. This setting is dimmed if there is no microSD card installed, if you have already unmounted it, or if you have mounted the microSD card on your computer.
Format SD card
Permanently erases everything on a microSD card and prepares it for use with your phone. You must unmount a microSD card before you can format it.
12.11.2Internal storage
Available space
Display the amount of internal phone storage used by the operating system, its components, applications (including those you downloaded), and their permanent and temporary data.
If a warning message comes up saying that phone memory is limited, you are required to free up space by deleting some unwanted applications, downloaded files etc.
12.12Language & keyboard
Use the Language & keyboard settings to select the language for the text on your phone and for configuring the onscreen keyboard, including words that you’ve added to its dictionary.
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