This hidden feature is called Accessibility Shortcut and, once switched on, it's activated by triple clicking your iPhone's lock button. It's just one of the dozens of hidden iPhone features that you really should know about in order to get the most out of your Apple smartphone.
A triple-click within a paragraph in the text area selects the entire paragraph. A triple-click in the left margin (when the mouse pointer is an up-and-to-the-right arrow) selects the entire document.
Triple-click the side button or Home button to turn the accessibility features of your choice on or off. Go to Settings > Accessibility > Accessibility Shortcut, then select the features you want. If you select only one feature, the feature is immediately turned on or off when you click the button shortcut.
A triple-click within a paragraph in the text area selects the entire paragraph. A triple-click in the left margin (when the mouse pointer is an up-and-to-the-right arrow) selects the entire document.
If you enter the wrong passcode four times in a row, you'll be locked out of your device, and you'll receive a message that says iPhone is disabled. If you can't remember your passcode, you can erase your iPhone with a computer or with recovery mode, then set a new passcode.
To turn the feature on, go to Settings > Emergency SOS. Then you'll want to make sure Call with 5 Button Presses is toggled on. If you've got an iPhone 7 or earlier then by default you're required to rapidly press the side or top button five times. Another useful option to set up is Call Quietly.
This is where Sending SOS Messages will come into play. By quickly pressing the power key button 3 times, you are able to send a quick alert to your emergency contacts. Not only that, but you are also able to attach a 5 second audio recording and pictures from both the front and rear cameras.
Note: To lock iPhone again, press the side button. iPhone locks automatically if you don't touch the screen for a minute or so. However, if Attention Aware Features is turned on in Settings > Face ID & Passcode, iPhone won't dim or lock as long as it detects attention.
To see more of the screen, do any of the following: Adjust the magnification: Double-tap the screen with three fingers (without lifting your fingers after the second tap), then drag up or down. Or triple-tap with three fingers, then drag the Zoom Level slider.
➡️ Use an intruder detection app
Additionally, intruder detection apps record the date and time of the unlock attempt, meaning you can pinpoint precisely where and when your phone was accessed.
The seventh incorrect passcode attempt will lock you out for 5 minutes, the eighth attempt for 15, and the tenth for an hour. If you go past ten attempts and have still not entered the correct passcode, you'll receive the message iPhone is Disabled; Connect to iTunes.
If you want to make an anonymous call, you can use *#31# followed by the number you are calling, and your caller ID will be withheld for that one call.
Criminals could also gain access to any passes like train tickets and bus passes that you can access via your Apple Wallet from Control Center, so again consider disabling this. Control Center makes a lot of key functions accessible without having to even unlock the iPhone — convenient, but also a security risk.
Use double-click to select an entire paragraph by clicking anywhere within it twice. Triple Click Function: Harness the power of triple-clicking to select an entire document paragraph at once. Effortlessly highlight a full line by triple-clicking on it.
Triple-click the side button or Home button to turn the accessibility features of your choice on or off. Go to Settings > Accessibility > Accessibility Shortcut, then select the features you want. If you select only one feature, the feature is immediately turned on or off when you click the button shortcut.
In some programs, middle-click lets you use program-specific features. For example, in Internet Explorer 7, you can middle-click a link to open the link in a new tab. Turns off the mouse button. Functions the same as pressing ALT on the keyboard.