To turn off an iPhone with a broken power button and screen, use a button combination (Volume Up, Volume Down, hold Side Button, then Volume Up + Side Button until black) for a force shutdown, use Siri ("Hey Siri, power off"), or rely on AssistiveTouch if previously enabled (Settings > Accessibility > Touch > AssistiveTouch) to bring up a virtual power button/slider from the screen's corner, allowing shutdown via the Control Center icon.
Three-finger gestures on iPhone primarily activate accessibility features like VoiceOver (for screen reading and navigation) and Zoom (magnification), allowing scrolling, zooming, and text manipulation (copy/paste/undo) with specific taps and drags, though some text actions work without VoiceOver enabled for quick editing. Common gestures include three-finger double-tap to toggle VoiceOver speech, triple-tap for the screen curtain, and pinching/spreading with three fingers for copy/paste actions, notes this YouTube video.
*3001#12345#* on an iPhone activates the hidden Field Test Mode, a diagnostic tool for network engineers and power users to see detailed cellular data like signal strength (dBm), cell tower info, and network quality, accessible by dialing the code in the Phone app and pressing call, often after turning off Wi-Fi for accurate cellular readings.
Messages automatically uses the following screen effects for specific text strings:
Turn off Find My: Go to the Settings app > your name > Find My, then tap "Find My [Device]" and turn it off*. If you can't turn off Find My this way on your iPhone, go to the Find My app or iCloud.com/find, select your iPhone, then select Remove This Device and follow the onscreen instructions to prepare it for repair.
The risk of system corruption is significant when you forcefully restart. The operating system (OS) manages numerous processes and data exchanges; interrupting these can lead to corrupted system files.
3-finger double tap: zooms in/out the screen. 3-finger triple tap: toggles VoiceOver speech on/off. 3-finger quadruple tap: toggles the screen curtain on and off. 3-finger drag: drags around the zoomed screen.
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.
On an iPhone, dialing *#21# is a USSD code used to check the status of your unconditional call forwarding, revealing if your calls, SMS, or data are being redirected and to which number, without actually changing settings; it's a simple privacy check to see if someone has secretly set your phone to forward everything, though it doesn't detect advanced spyware. Dialing this code brings up a message from your carrier about your call forwarding status, often showing "Disabled" or a specific number if it's active.
Hidden Battery Power / Boost Signal Strength
By pressing *3370# or #3370#, you'll activate your phone's “reserve battery power”. Battery life will increase by 50%.
Although Siri is technically always listening in the sense that it is listening for its trigger phrase, it's important to recognize that it only starts recording after it hears “Hey Siri.” This means that Siri is not constantly recording or remembering everything you say.