Wiko POWER U20 Guide D'utilisateur page 10

~ Turning the Phone On and Off
To turn the phone on, press on the ON/OFF button and hold
it down until the phone switches on.
If your SIM card is locked, you must enter the correct PIN
code to unlock the SIM card when the phone is powered up.
Your PIN is supplied by your operator; if you did not receive
it or have lost it, please contact them.
When the PIN is entered incorrectly three times, the mobile
phone is blocked and has to be unblocked using your PUK
(this is supplied with the SIM card; if this is not the case,
you should contact your phone operator).
To turn the phone off, press and hold the ON-OFF button until
the menu opens, then press on Power Off .
The phone vibrates when it is shut down completely.