We've already walked you through the biggest changes in iOS 9 and the newest capabilities of the iPhone 6s , but we've barely tapped the surface. The latest version of iOS is brimming with tricks that will make your life easier, if you know where to look.These tips and tricks will apply for you whether you're on a brand new 6s Plus or upgraded your existing handset to iOS 9. If you haven't updated yet, the update is free and and available for the iPhone 4s and later. You'll need 1.3 GB of storage. (You can check that in Settings, General, Storage & iCloud Usage.) The download shouldn't take too long over a good Wi-Fi connection. And as long as your battery is mostly charged, you don't even have to plug your phone into your computer to do it. Just be sure to back up your phone first — just in case something goes awry. You wouldn't want to lose your photos or important app data.So now that you've got iOS 9, we've laid out seven of our favorite hidden tricks for you. Read on to check them out.