How to install the iOS 15 and iPadOS 15 public betas

beta profile ios 15Open Safari on iPhone or iPad, and go to the Apple Beta Software Program website, sn in with your Apple ID, and enroll in the beta program for iOSiPhone models with a USB-C port include all iPhone 15 models and newer. ... introduced in version 2.7 of the specification. iOS 18 supports RCS Universal Profile 2.4.