1/ Mark up images then email them — El Capitan on Mac lets you ‘mark up’ or annotate emails. In iOS 9, we can do that same thing on our mobile devices, too. Attach an image to a message, either from your Camera Roll in the Photos app using the Share button or by tapping within the body of your email to bring up a menu.
From that menu, you can navigate to Insert Photo or Video.
Once the picture is in the email message, tap it to bring up another menu, and then pick Markup.
You are taken to an editing window where you’ll have similar tools to the ones in OS X. You can draw a square around something, even add your signature, insert a text box, or use a loupe to call out a section of your photo.
Once finished, tap Done and the changed version of your picture is saved into the email, ready to send.
2/ Get Siri to only recognise your voice — If you have to ask Siri things when your in environments with lots of other voices, this is for you. Go to Settings > General > Siri and make sure Siri is turned on. Then tap the “Allow ‘Hey Siri’ ” button (it turns green).
Siri asks you to say “Hey Siri” three different times, then say “Hey Siri, how’s the weather today?” and finally, “Hey Siri, it’s me.”
After you’ve done this, tap the Done button.
3/ Tell Siri to set appointments — Press and hold the Home button on your iPhone or iPad. You’ll hear Siri chime so you’ll know it’s ready for input.
Tell it, say, “Remember to pick up Laura’s Christmas present at 3 p.m. tomorrow” or “Schedule a long bike ride for 7:30 a.m. on Saturday.”
Say “Cancel” or “Yes” to confirm the appointment, or you tap Cancel or Confirm to either stop or confirm the appointment. (Siri will warn you if you have conflicting appointments.)
4/ iPhone 6 Plus and Landscape Mode — The iPhone 6 Plus and the new 6s Plus have the ability to have the home screen in landscape mode (with the iPhone held horizontally) or portrait (iPhone held vertically). But you may not want the home screen to switch when your iPhone is in a horizontal position when shooting videos, for example. It will move to a vertical position when you move your phone, but maybe you have reasons for not wanting the home screen to switch. Some Apple apps, like Contacts and Mail, display a two-pane interface when in landscape mode but others, like Music and Activity, only work in portait mode.)
While you can use the orientation lock in Control Center (swipe up from the bottom of the screen), there’s another way to do it.
Open the Settings app.
Tap Display & Brightness.
In the list of settings, look for Display Zoom. Under that heading, you should see View. Tap it.
You will find two tabs to select: if you select Standard, it allows your home screen to switch between landscape and portrait modes. If this is want you want, tap Standard.
If you select Zoomed, this will turn off landscape switching, but everything on your iPhone Plus screen will appear just a bit bigger. If you’re OK with that, tap Zoomed. Tap Set at upper right and your iPhone 6 or 6s Plus will restart to implement the changes.
5/ Two-finger text selections — If you’ve ever tried to grab those tiny blue handles to select text on your iPad or iPhone, you’ll know how infuriating the process can be. For those who’ve upgraded their devices to iOS 9, good news: if you’re selecting text in the Mail app, in Messages, or any other app with an on-screen cursor, your life is about to get a whole lot easier. Tap and hold two fingers on the screen and start swiping your fingertips around. The cursor will start moving around, following the general direction of your fingers (and you can swipe over the on-screen keyboard if you want).
Next, tap the screen to get the standard cursor back again, do the two-finger trick, but this time keep the cursor in place rather than swiping it around.
Within a second or so, the text-selection handles will appear. When they do, keep your two fingertips on the screen and swipe; doing so drags the selection box back and forth, giving you pinpoint control over the text you want to select.