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/.
iPhoneâs 10th-year-anniversary handset is definitely its most expensive iPhone yet. The heavy price tag can be accounted for its large and almost completely bezel-less 5.8-inch screen which is then partnered with a Super Retina OLED screen at 2436 x 1125 pixel resolution.