LG KG290 User Manual page 155

Note
]
MASS STORAGE function will only work
when the phone is in idle mode.
]
DO NOT remove the cable while you are
downloading files. After you download
the files, you need to click "Safely
Remove Hardware" on the PC and then
disconnect the cable.
]
When you copy a file to the removable
disk, you can see a message on the
display "transferring". It means MASS
STORAGE is working and data is being
transferred. While "transferring", do not
disconnect the cable. If you disconnect
the cable while "transferring", data will
be lost or corrupted and possibly damage
the phone.
]
If you receive a call when using as MASS
STORAGE the call will be rejected.
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