Dell Venue 8 3840 - Manual (Page 23)

Protecting Your Tablet
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4. Type the password again to confirm.
5. Tap OK.
Disabling or changing the password
1. Tap → Settings→ Security→ Screen lock→ Password.
2. Type the password you have enabled.
3. Select None to disable the password or select Password to change password.
Protecting your SIM card with the SIM lock password
(LTE/HSPA+ models only)
You can protect your SIM card against unauthorized use with a PIN. After a PIN is enabled
to lock your SIM, you will need to enter the PIN each time you turn on the tablet in order
to unlock your SIM.
CAUTION: The SIM card will be permanently locked if you enter the incorrect PIN
for three consecutive times. You must then enter the Personal Unblocking Key
(PUK) to unlock the SIM card. Contact your service provider to obtain the PUK.