How to turn your Apple iPhone 15 Pro Max on or off

Press and hold the Side button until your phone is turned on.

Slide your finger upwards starting from the bottom of the screen.

0000

0000

Key in your SIM PIN and press OK. The default SIM PIN is 0000.

If an incorrect SIM 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. Sign in to the O2 website to get the PUK. Please note: If you key in the wrong PUK ten times in a row, your SIM will be blocked permanently. In this case, you need a new SIM from O2.

At the same time, press and hold the Side button and the Bottom volume key until the power off icon is displayed.

Press and drag the power off icon right.