Iphone 4 ios最高

The iPhone 4 was released in 2010 and was originally shipped with iOS 4. Over the years, it received updates to newer versions of iOS. The highest iOS version that the iPhone 4 can run is iOS 7.1.2. iOS 8 and subsequent versions of iOS are not supported on the iPhone 4 due to its hardware limitations.

It's important to note that even if you could install iOS 8 or a newer version on an iPhone 4, the device might not be able to run the operating system smoothly, as it was not designed to support the features and performance requirements of those newer versions of iOS. Therefore, it's generally recommended to keep the iPhone 4 running on the latest supported version of iOS that it was designed for, which is iOS 7.1.2.