I have problems using my Apple iPhone 16 Pro Max as a personal hotspot

Press Settings.

Press Personal Hotspot.

Press Wi-Fi Password and key in the required password.

Press Done.

The password prevents others from accessing your personal hotspot without your approval.

Press the indicator next to 'Allow Others to Join' to turn on the function.

If WiFi is turned off, press Turn on Wi-Fi and Bluetooth.

If WiFi is turned on, press Wi-Fi and USB Only.

Slide your finger upwards starting from the bottom of the screen to return to the home screen.

Turn on WiFi on the other device.

Find the list of available WiFi networks and select the personal hotspot you've just set up.

Key in the password for the personal hotspot and establish the connection.

When the connection is established, you can access the internet from the other device.