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 iPhone X â or iPhone 10 â is a hugely important device for Apple. Not only does its release coincide with the 10th anniversary of arguably the most important tech product of the past decade, but itâs the first iPhone in four years to undergo a major redesign.