Powerful Search Options:
There are plenty of new search capabilities in iOS 9.
Spotlight Search allows you to search directly for apps in the AppStore and inside apps installed on your phone (not just Apple apps like it used to - the entire apps you own). That’s powerful stuff.
In addition, the settings app now has a top search panel that will let you quickly find the settings you look for. Very handy especially since so many important settings are hidden under the “general” category…
There are a lot of details about the new multi-tasking capabilities for iPads: you can work with 2 apps at any given time (Windows 8 style) and switch quickly from one app to another.
However, what I find also important is the fact that whenever you navigate away from an app through a link or a button (like opening a link to a website from WhatsApp) - you get a tiny new back button that will take you back to the original app. That’s very useful, and much easier to use than double clicking the home screen to switch manually to the previous app.
Most smartphones give Wifi a priority over cellular even if the Wifi signal is very weak. It means that you sometimes suffer from a slower network since your Wifi signal is weak, but the phone refuses to switch to 3G or 4G. With iOS 9 your iPhone will switch to cellular in the case of poor Wifi network.
This can be turned off if you are really… cheap… but for people looking for maximum productivity I think it’s a real savior.
Useful New Features in the Photos App:
There are a bunch of new features in the photos app such as quick navigation, zoom into videos and more.
2 features that will save you a lot of time is the ability to quickly select multiple photos using swipe gestures and 2 new folders for screenshots and selfies. While most people will love the selfie folders, I actually think that the screenshots folder might become handy to anyone working on apps (developers, QA or designers).
Oh, there’s also this nice new pull-down gesture to quickly close a photo without hitting the back button.