The equals sign means is equal to. It is telling us that one thing equates to another; that they are the same.
The iPhone 4 is the most recent iPhone to be discontinued from the iOS Update cycle. It did not receive the iOS 8 update, so it's final software version is iOS 7.1.2. You can update to this version through iTunes, or download it from an IPSW repository like this website: https://ipsw.me/.
What's Next. The iPhone 6 and the iPhone 6 Plus were followed by the iPhone 6s and the iPhone 6s Plus, which launched on September 25, 2015. More information on Apple's latest iPhones can be found in our dedicated iPhone 6s roundup.hat's Next. The iPhone 6 and the iPhone 6 Plus were followed by the iPhone 6s and the iPhone 6s Plus, which launched on September 25, 2015. More information on Apple's latest iPhones can be found in our dedicated iPhone 6s roundup.