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 most-downloaded free iPhone app in 2016 is Snapchat, which moved up from number five on last year's list and is replacing Trivia Crack in the number one slot. Facebook Messenger remained the second most-downloaded app, while PokÃ©mon Go was the third, taking Dubsmash's spot from 2015.