1/ Change your iPhone’s video capabilities — Apple’s default is the “1080p HD at 30 fps” choice. Go to Settings> Photos & Camera>Record Video. There’s a handy approximation (in yellow) for how much space you’ll be taking up with each configuration. So if you only have a 16GB iPhone, it’s probably not that wise to record only 4K video unless you plan on clearing off your Camera Roll approximately every day of your life. If you select any of the other options, your device will helpfully inform you of that whenever you’re taking videos from then on.
If you’re on the default setting, though, you won’t see any info in that spot.
2/ Stop your screen rotating — Does your phone switch orientations on you at random, just because you tilted it slightly too far in one direction or another? To prevent this sort of annoyance (in my case, reading in bed is the best time to lock screen rotation). Luckily iOS has screen rotation lock: wake your iPhone if it isn’t already, then slide your finger up from the bottom edge to bring up Control Center. Tap the Orientation Lock button (the lock icon with a circular arrow surrounding it at top right) so it turns white. Slide the Control Center pane down again to hide it, and your screen’s contents will no longer rotate as you turn your device on its side.
3/ Lock rotation on iPad — The rotation lock works pretty much the same on the iPad, but with an added caveat: you can switch the Mute button toggle on the left side of the device to function as the orientation lock switch instead. Go to the Settings app, tap General, then tap Lock Rotation under the “Use side switch to:” heading. When you switch the side toggle to function as the rotation lock, the Mute function takes the rotation lock’s place in Control Center.
4/ Remember that Siri is more intelligent — You can now say things like you can ask things like “Remind me to take my coffee off my roof when I get in the car,” because Siri knows when you get into your car. It’s almost like actually having a human helper. (Moreover, thanks to the new frugal M9 co-processor, you can call Siri from a locked screen even on the iPhone 6s and 6s Plus.)
5/ iOS 9 on iPhone 6s and 6s Plus — If you have the latest version of Apple’s iPhone, remember that pressing harder on apps gives all sorts of other capabilities, and it can do Live Photos (which animate for a few seconds) but they take up lots more space. If you have an ‘s’, check out Mac Observer’s catchup page to remember all its new tricks.