To manually turn off Caller ID, you can use a per-call code like *67 (US/Canada) before the number for a temporary block, or change settings in your phone's Phone app > Settings > Calls/Supplementary Services to hide it permanently; the specific steps vary by phone, but often involve finding the "Show My Caller ID" or "Caller ID" option and selecting "Hide".
Hide your number using Android settings
Yes, *69 can work in Australia for Call Return on some networks like Optus, but Telstra uses *10# for a similar service, and it often involves per-use charges; however, mobile networks often store caller ID, making landline-style codes less universal, with features depending on your specific provider and service plan.
To block your mobile phone number on a per-call basis, dial #31# before each phone number you call. To permanently block your number use your Call Settings menu. Get step-by-step instructions for your device on how to hide your caller information.
You can prevent your Caller ID information from showing on outgoing calls on iPhone.
141 – Withhold your number
Just dial 141 followed by the number you want to call. If your number is withheld the message 'withheld' is returned if the person being called uses 1471 to find out the identity of the caller.
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.
Access the personal IMEI number by keying *#06# the 15 digit serial number will appear on the screen. Make a note of the number and register the details with your operator, in the event that your phone is stolen you report it to you operator who should then be able to bar the SIM card.
To temporarily block caller ID on a call-by-call basis, dial 1831 (or #31# from a mobile) then dial the number you are calling.
Have you ever noticed that phone numbers in movies and TV shows often start with 555? That's because the 555 exchange is reserved—real customers are never assigned these numbers. If you receive a call from a 555 number, it's a scam.
You can trace a no caller ID by dialing *57, which automatically tracks the last call you received and alerts your phone service provider (and local law enforcement if necessary) to potential criminal activity along with a recording of the call.
Enter *67. Enter the number you wish to call (including area code). Tap Call. The words "Private," "Anonymous," or some other indicator will appear on the recipient's phone instead of your mobile number.
To hide your number for one call, enter 141 before the number you're calling. If you've hidden your caller identity, enter 1470 before the number to show it for that call.
Yes, *67 still works in 2025! If you dial *67 before a phone number, it hides your caller ID, so the person you're calling sees “Private” or “Blocked” instead of your number. This works on both iPhone and Android devices.
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.
Dial *#62# to see if any call forwarding is active on your iPhone. Check for a call forwarding number. Dial *#67# to see where your calls are being forwarded or redirected without your knowledge.
Dial a USSD code.
One of the more clever ways to check for certain (but not all) spyware is to dial a USSD code on your phone. Call *#21# or *#62# and listen for information on whether or not your phone is being tapped.
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.
##002# cancels all forwarding on many GSM networks worldwide. Dial ##002# and press call. You'll usually hear a confirmation message.
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.
Please note: On older versions of Android steps may differ. Caller ID settings can usually be found in Phone app > More options > Settings / Call Settings > More / Supplementary settings. Find out more about how to use the different call functions on your device.
You can prevent your Caller ID information from showing on outgoing calls on iPhone. Go to the Settings app on your iPhone. Tap Apps, then tap Phone. Tap Show My Caller ID, then turn it off.