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If you forget the unlock pattern then after five attempts you can
enter your Google account details to unlock your device. If you
have not registered a Google account then contact your service
provider.
SIM Card Lock
Set a PIN code on your SIM card to prevent others from using
your account. The initial PIN code is provided by your service
operator.
1. Tap Home
> Menu
> Settings > Location & security >
Set up SIM card lock.
2. Select Lock SIM card. Enter the PIN and tap OK.