Wiko STAIRWAY - Manual (Page 33)

~ Turning the Phone On and Off
To turn the phone on, press and hold the ON/OFF button.
If your sIM card is locked, you must enter the correct
PIN code to unblock the sIM card when the phone is
powered up.
To turn the phone off, press and hold the ON/OFF but-
ton until the menu opens, then press on switch
Off. Now
press Ok to confirm.
The phone vibrates when it is shut down completely.