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/.
Appleâs latest iPhone is a curious hybrid of old and new iPhone features. Most of the iPhone SEâs features are ripped straight from the iPhone 6s, the 4.7-inch handset that Apple most recently launched in September 2015.