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/.
The new iPhone X, which Apple revealed on Tuesday, is the most futuristic, most expensive phone Apple has ever built. But have you seen that notch at the top of the phone? Yuck. The notch at the top of the iPhone X, and the two ears on either side. Dave Smith/Business Insider Apple event attendees who got to try the phone already say the iPhone X is easily the most gorgeous iPhone ever built, especially with its edge-to-edge OLED screen that Apple calls its Super Retina Display.