You might not have realized that iOS has an extra built-in app hidden behind the Compass. If you load up the Compass, then swipe left, you’ll find a level tool. Use it to make sure your pictures are hanging correctly. An iPhone may not be as precise as a dedicated level, but it’s very handy.

If you know the frustration of mistyping a digit and then having to start the calculator all over again, there is a hidden backspace function, so you won’t have to revert to the C or AC buttons every time you make a mistake. Just swipe to the left or the right at the top of the screen where the digits are displayed. The motion acts as a backspace command and will remove the number you entered last.

While we’re talking about the Calculator, have you ever put the app into landscape mode with a twist of your iPhone? This view reveals a host of extra functions. Those of you who prefer a visual phone alert to an audible one will like this: you can get your iPhone’s flash to light up when a notification is displayed. This could come in handy during meetings, when many people place their phones face-down on top of a table. To get the feature working, go into Settings and then tap General and Accessibility. Switch the LED Flash for Alerts toggle switch to on and you’re done.

If your iPhone’s Message app has too many photo attachments, you can delete them and gain more storage space. Just go to Settings > General > iPhone Storage, scroll down to Review Large Attachments and tap it. Now, you’ll get a whole list of all the attachments you sent in Messages. Tap Edit, select all the ones you want to trash and you’re good to go.

And if you’re on an iPhone X and have sent a lot of Animojis, you may delete the ones you don’t need as well. They’re saved as video files, and you definitely don’t want them clogging up your phone storage.

If you hit your iPhone lock button quickly five times in a row, an emergency SOS slider will pop up on your screen. When slid, it will initiate a 911 call.

Emergency SOS is available for all iOS 11-capable devices, but it’s only accessible via the five quick presses on iPhone 7 and earlier. For iPhone X, iPhone 8 and iPhone 8 Plus, one must press and hold the side button and a volume button to make the slider appear.

An additional feature called Auto Call activates a personal security alarm that counts down aloud and calls emergency services when it gets to zero. If you would like to turn this off (and be able to discreetly call 911), just go into your setting and turn Auto Call off.

Lastly, I would like to thank all of you for your donations to help LuLu’s medical expenses. Had she not had her infected tooth removed, she would have died a horrible, painful death a week later, as the infection would have traveled to her brain. She’s doing well and having fun playing for the first time with another dog. She even started barking and wagging her tail!

Send your computer-related questions to mauimist8669@yahoo.com.