Apple has released the iOS 26 public beta, allowing users to test the upcoming operating system on compatible iPhones. A key feature is the 'Liquid Glass' design, described as Apple's most significant visual update in years. Users can either download the public beta or read a detailed preview. However, not all iPhones are compatible with iOS 26. Apple has confirmed that some older models will not be supported in 2025. Check the list to see if your iPhone can run the new OS.