LG MM-535 Owner's Manual page 57

Resetting the phone restores all the factory defaults, including the
ringer types and display settings. The Contacts, Call History,
Scheduler, and Messaging are not affected.
From the Security menu, select
(A disclaimer appears.)
Read the disclaimer and press
If you are certain that you would like to restore all of the factory
settings, select
Press
There may be occasions when you want to limit the numbers your
phone can call. You can use the Restrict Calls setting to do just that.
(The Restrict Calls setting does not apply to 911 or Sprint Customer
Service.) When a Restrict Call setting is activated, you will be
prompted to enter your lock code to complete calls to the designated
numbers.
From the Security menu, select
Select
press
From the Security menu, select
Select
; otherwise, select
.
,
.
and press
.
, or
.
( ).
.
( ).
and
( ).