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/.
Patrick Frye. The latest iPhone 7 rumors all seem to confirm expectations that a 2015 release date is inevitable, but the surprise is the idea that Apple will release three new iPhone models next year, just not two like with the iPhone 6 launch.