Instant Hotspot on your Mac
Lost your Wi-Fi connection? With Instant Hotspot, you can use the Personal Hotspot on your iPhone or iPad to connect your Mac Pro to the internet instantly—no password required.
Note: Personal Hotspot requires an iPhone or cellular-model iPad, with iOS 8 (or later) or iPadOS installed.
Connect to your device’s Personal Hotspot. Click the Wi-Fi status icon 
in the menu bar, then choose your iPhone or iPad from the list of devices that appears. The Wi-Fi icon changes to 
. (You don’t need to do anything on your device—Mac Pro connects automatically.)
Tip: If you’re asked for a password, make sure your devices are set up correctly. See the Apple Support article Use Instant Hotspot to connect to your Personal Hotspot without entering a password.
Check the status of your connection. Look in the Wi-Fi status menu to see the strength of the cellular signal.
When you’re not using the hotspot, your Mac Pro disconnects to save battery life.
Learn more. See Use an iPhone or iPad to connect to the Internet in the macOS User Guide.