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/.
But even if your company isn't a common topic of bloggers, there are more old-fashioned ways to listen to your customers. What's unique about Apple's two most recent product launches, the iPhone 4s and iPad, is the remarkably minor changes the company made to create an abundance of demand.