Go to OSX Daily to read How to Install iOS 15 Developer Beta on iPhone
Apple introduced iOS 15 at the 2021 WWDC event, and its early build is already available for developers to download and install. If you’re a developer yourself, or just have a dev account, you probably want to try out iOS 15 beta and install it onto an iPhone so that you can check it out.
While iOS 15 dev beta is aimed at developers, technically anyone can get into the developer program by paying a $99 annual fee. Don’t want to spend money to test out an early build? No problem, Apple will roll out the public beta in July.
Interested in taking a first look…