LG P970 User Manual page 111

When you cannot recall your unlock
pattern
If you logged in to your Google account on
the phone but failed to enter the correct
pattern 5 times, tap the Forgot pattern
button (or, if you preset the backup PIN, you
can use the backup PIN code to unlock the
pattern). You are then required to log in with
your Google account to unlock your phone.
If you have not created a Google account
on the phone or you forgot it, you have to
perform a hard reset.
If you have forgotten your PIN or
password: If you have forgotten your PIN or
password, you need to perform a hard reset.
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