What does “widely supported” actually mean? What an odd thing to write on a tech product page.
iPhone's from iPhone 7 and up are supported in setting up the Wifi block, and iPhone X's and above support the guest functionality of tapping to connect to Wifi.
Most Android devices created from 2018 and after are supported. A good way to know if your device would be supported or not is whether or not you use Android or Apple pay.
Thanks again for taking a look and your feedback!