To block your ID (Caller ID), you can use a prefix like *67 (US/Canada) or #31# (Australia) for a single call, or change settings in your phone app (under Calls > Additional settings > Caller ID) for a permanent change, or contact your carrier for account-level blocking; different methods work for temporary or permanent blocking on Android, iPhone, or landlines.
To block your number from being displayed temporarily for a specific call: Enter *67. Enter the number you wish to call (including area code). Tap Call.
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.
To permanently block CND on all calls from your phone, contact your telco. 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.
No, *67 doesn't work in Australia; the correct code for per-call caller ID blocking on mobile phones is #31#, while 1831 (or sometimes 1832 to show your number) works for landlines, but you can also set a default in your phone's settings or use carrier-specific codes like Telstra's. For hiding your number in Australia, use #31# before the number, or check your phone's settings to block it by default for all calls.
Yes, *69 (Call Return) can work in Australia, but it depends on your service provider, with Optus supporting *69 on its HFC network and Telstra using \*10# for a similar function, often with a small fee per use, to dial back the last incoming call. It's a carrier-specific service to call back your last missed call, but it won't reveal private numbers.
To turn off caller ID, open Settings. Locate and tap Phone. Tap Show My Caller ID. Swipe to turn caller ID off.
One way to block No Caller ID calls on Android is by utilizing the nifty feature called "Block Unknown/Private Numbers." This handy option can be found in most Android phones' call settings.
“How to call back no caller ID” is a popular search, and there's an easy answer. To call back the last private number that called you – whether you answered it or not -- simply dial *69 and it will dial it back. It will also unmask the number, if it's been blocked from caller ID.
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.
Quick Tip: Test Your Samsung Phone with *#0*# Before buying a Samsung phone, use the code *#0*# to check its hardware! This secret menu lets you test the screen, buttons, speakers, sensors, and more. It's a quick way to ensure everything works perfectly and avoid issues later.
Using Stock Android or Google Pixel
This Vertical Service Code, *82, enables calling line identification regardless of subscriber preference, dialed to unblock withheld numbers (private callers) in the U.S. on a per-call basis.
The classic option of dialing *67 before the number you're calling still works. This only blocks the call you're making at that moment, not any future calls. There are also a number of burner apps you can use to contact people without providing your actual number.
Follow these steps to hide your identity online as much as possible:
Screen, silence or filter calls in the Phone app and FaceTime. In both the Phone app and FaceTime, you get to decide who can contact you, and when. There are a few ways to do this: screen or silence unknown callers, filter unknown callers and silence spam callers.
Learn how to setup call blocking for your digital phone service. Use the AT&T Phone voice portal or *61 to block up to 100 numbers.
Dialing *69 is a simple way to find out an unknown caller's number for free from your iPhone, Android, or landline. This service has been available for decades in the US and still works today. Here's how to trace an unknown number using the *69 service: Dial *69 on a mobile or landline.
Hide your number using Android settings
What is BT 1471? BT 1471 tells you the last number that called - unless the caller withheld their number by dialling '141' before dialling your number, or the call came from a switchboard extension number. 1471 Call Return also lets you return the call straight away, by pressing '3'.
To hide your caller ID on an iPhone, go to Settings > Phone > Show My Caller ID and toggle the switch off; this hides your number for all calls, but it's carrier-dependent and *67 works for single calls, though carrier settings are the primary way.
To make your number private in Australia, dial #31# before the number for a single call, or set it permanently in your phone's settings (under Call Settings/Supplementary Services) to 'Hide number', contacting your telco if needed; this works for calls but not SMS, and emergency services always see your number.
You can hide your caller ID for individual calls by dialing \*67 (in the US/Canada) or #31# before the number, or permanently by changing settings in your phone app's settings menu (Phone > Supplementary services/Calls > Caller ID) on both iPhone and Android, though this may not work for emergency services or businesses.
What's No Caller ID? When No Caller ID appears during incoming calls, that means the caller has deliberately blocked their information. A No Caller ID call can be legit—it may be from an organization or person who simply wants to keep their contact information private.