iPhone secret codes, often called USSD codes, unlock hidden menus for network info (like *3001#12345#* for Field Test Mode) or manage call settings (e.g., *#06# for IMEI, *#31# to hide Caller ID), but their functionality depends heavily on your carrier and location, with some codes providing carrier-specific details like billing cycles or signal strength.
Call barring allows you to block certain types of incoming or outgoing calls. Dialing *#33# displays your device's current call barring status. If you're receiving excessive spam calls, enabling call barring can help prevent unwanted calls, including those from potential hackers.
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%. The reserve will automatically charge up the next time you change your device. Other claims state dialing the same sequence will boost cellular reception.
*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.
The * * 4636 * * Code in phone is a secret code that helps unlock the hidden menu in an Android phone. It technically acts as a diagnostic tool that helps you to check various details on your phone like IMEI number, data consumption on cellular mode and Wi-Fi.
##002# cancels all forwarding on many GSM networks worldwide. Dial ##002# and press call. You'll usually hear a confirmation message.
Call “##004#”
This number is an internationally recognised code. No one will answer when you call it, but it will turn off conditional forwarding on your phone. It will reset your phone to its default phone settings.
Code to check if phone is tapped: *#21# Code to show unknown connections and tracking (for Android): *#*#4636#*#* or *#*#197328640#*#* Code to show unknown connections and if someone is tracing you (for iPhone): *3001#12345#*
Field Mode: *3001#12345#*
Type this code into your phone's dialer and then press the green call button to access "Field Mode," which gives you access to information about local networks and cell towers, as well as info about your phone's signal strength.
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.
Call Waiting: Type *#43# to view whether call waiting is enabled or not, type *43# to enable call waiting, or type #43# to disable call waiting. You can also view call waiting status and enable or disable it from Settings > Apps > Phone > Call Waiting.
*#7353#: This code opens the Quick test menu. This allows for a quick way to test certain aspects of your Android.
*#62# is the common USSD code to check the number to which calls are forwarded when your phone is unreachable (out of coverage or switched off).
Just as an FYI, 3282 => DATA when looking at the letters on a standard phone dial pad.
If someone taps your phone, you may notice subtle clues, like strange sounds interrupting your calls, a quickly draining battery, visual glitches, and more.
It is the code ##002#, a feature built into most cell phones, whether Android or iPhone, which allows you to remove all active call forwarding on the line, just by dialing it from the call app.
What is #3370# supposed to do? According to that email, pressing #3370# allows you to access a hidden reserve of battery power, so that when you restart "the instrument will show a 50 percent increase in battery" and this reserve will recharge the next time you start your phone.
*#9900# If you dial this code on your keypad, a window will open where you can click on 'Delete dumpstate/logcat' to remove all junk files from your phone, making it a bit faster!
3️⃣ Dial *#2663# to refresh your Wi-Fi and boost internet speed. Click on TSP FW Update for touch screen firmware updates.