iPhone 4s iOS 9 Update: 10 Things to Know After Three Weeks

iOS 9.1 Beta 4 Performance

Earlier this week, Apple released an iOS 9.1 beta 4. Like the name suggests, this is the fourth iOS 9.1 beta for iPhone 4s.

We're starting to see developers and testers provide feedback about the update and you should be taking notes as we approach the iOS 9.1 release date. Track its performance all the way up until the actual release. If you do this, you'll be prepared for the public release.