Lost your Wi-Fi connection? With Instant Hotspot, you can use the Personal Hotspot on your iPhone or iPad to connect your iMac to the internet instantly—no password required.
Note: Personal Hotspot requires an iPhone with iOS 8 (or later) or a cellular-model iPad with iPadOS 13.1 (or later). See the Apple Support article next to your iPhone or iPad in the list (if you don’t see the list, click Other Networks). The Wi-Fi icon in the toolbar changes to Use an iPhone or iPad to connect your Mac to the Internet in the macOS User Guide.