LG -D125 User Manual page 343

NOTE: Use only compatible memory cards with your phone. Using
incompatible memory cards may damage the card and data stored on the
card, as well as the phone.
To format the memory card:
Your memory card may already be formatted. If it isn't, you must format it before you can
use it.
NOTE: All files on your memory card are deleted when it is formatted.
1 Touch to open the application list.
2 Scroll and touch Settings > Storage.
3 Touch Unmount SD card.
4 Touch Erase SD card > Erase SD card > Erase everything.
5 If you have set a pattern lock, input the pattern lock then select Erase everything.
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