Device Guides
Samsung Galaxy S21 5G
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How to
Turn mobile phone on and off
Before you can turn on your mobile phone, you need to insert your SIM into your mobile phone.
List view
Turn on your mobile phone
Tap and hold the Side key until your mobile phone is turned on.
Enter PIN
If you're asked to key in your PIN, do so and tap OK. The default PIN is 0000.
If an incorrect PIN is entered three times in a row, your SIM will be blocked. To unblock your SIM, you'll need to key in your PUK. The PUK can be obtained by contacting Customer Service. Please note: If an incorrect PUK is entered ten times in a row, your SIM is blocked permanently. In this case, you'll need a new SIM from Optus.
0000
Turn off your mobile phone
Slide two fingers downwards starting from the top the screen.
Tap the power off icon.
Tap Power off.
Tap Power off.
0000
0000
If you're asked to key in your PIN, do so and tap OK. The default PIN is 0000.
If an incorrect PIN is entered three times in a row, your SIM will be blocked. To unblock your SIM, you'll need to key in your PUK. The PUK can be obtained by contacting Customer Service. Please note: If an incorrect PUK is entered ten times in a row, your SIM is blocked permanently. In this case, you'll need a new SIM from Optus.
Slide two fingers downwards starting from the top the screen.
Tap the power off icon.
Tap Power off.
Tap Power off.
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