Dialing * by itself usually does nothing or might briefly show a dialing screen, but specific numbers starting with * trigger phone features like *67 (hide caller ID), *82 (unblock caller ID), or *69 (return last call), while *#002# (cancel all forwarding) or *#62# (check voicemail forwarding) are useful codes, and 911 is for emergencies, but always stay on the line if you dial an emergency number by mistake.
Enabled: You can display your Caller ID for a single outgoing call. Press *67, call the destination phone number, then press #. Disabled: You can hide your Caller ID for a single outgoing call. Press *82, call the number, then press #.
Dialing *#002# disables all carrier-based unconditional call forwarding instructions, meaning incoming calls will stop being redirected to other numbers.
Yes, *69 (Star 69) tells you who called by redialing the last number that called you and revealing the number, but it only works if the caller didn't block their ID using features like *67, and its availability depends on your phone carrier and service plan. It's a service that connects you back to the last caller or gives you their number, but modern smartphones often display this in the recent calls log anyway, making *69 less essential now.
Out-of-service (OOS) conditional call forwarding diverts incoming phone calls and text messages whenever your phone is turned off, or if it's without a network signal. To uncover OOS conditional call forwarding on GSM networks, dial *#62# and deregister unknown numbers using the ##62# reset code.
Dialing *#21# on your phone checks the status of your unconditional call forwarding, revealing if your calls, texts, or data are being redirected to another number without you knowing, often without leaving traces on your phone bill; it's a standard network code to see your carrier's call forwarding settings, not a definitive "hacking" tool, but useful for detecting unauthorized forwarding.
7 Proven Ways to Make Your Phone Unreachable
Dialing *77 on your phone activates Anonymous Call Rejection, blocking incoming calls from private or blocked numbers, making anonymous callers hear a message to hang up and try again. It's a landline/VoIP feature (like AT&T, CenturyLink) to stop spam/prank calls but can sometimes vary by carrier or state, potentially connecting to emergency services (like *87 to turn it off).
Can 67 Be Traced? Yes, *67 only hides your number from the person you're calling but doesn't make you completely anonymous. Phone companies and authorities can still trace the call if necessary. It only provides privacy on the recipient's caller ID, not complete anonymity.
Auto Redial is a service that dials a number that is busy for up to 30 minutes and alerts you with a distinctive ring when the line is no longer busy. To activate Auto Redial, press *66 (1166 from a rotary phone).
To turn off Call Forwarding from your mobile phone, call *73. You should hear a confirmation tone or message that may sound like a busy signal to let you know Call Forwarding has been turned off. Get step-by-step instructions on our Turn Call Forwarding off from device page.
If someone taps your phone, you may notice subtle clues, like strange sounds interrupting your calls, a quickly draining battery, visual glitches, and more.
How to block every incoming call. incoming calls to your line: *35*0000#.
Unlike No Caller ID, where the caller actively hides their number, Unknown Caller means the caller's information is not available or not transmitted properly and your phone service provider is unable to identify the caller.
The code *31# is a Universal Service Code (USSD) used on mobile phones to enable your Caller ID (show your number) on a per-call basis, especially if it's otherwise hidden or to re-enable it, contrasting with #31# which hides your number (shows "Private" or "No Caller ID") for that single call; it's a way to manage your privacy on calls.
*67 is a calling feature that allows you to hide your phone number when making calls. When you dial *67 before a phone number, your caller ID is blocked, and the person you are calling will see "Blocked," "Private," or "Unknown" on their caller ID instead of your actual phone number.
*69, a code widely available in North America, allows you to redial the last incoming call that you missed. The service is provided by most telephone service providers and operates by storing the caller's phone number, allowing you to quickly connect back to them.
Can I trace unknown, blocked, or private numbers? Private numbers, blocked, and restricted calls can usually be traced. However, unknown, unavailable or out of area calls are not traceable because they don't contain the data needed for a successful trace.
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.
Call Waiting: 43 (Various Combinations)
I reactivated the voice call waiting specifically with *#43#, and confirmed it in the iPhone's Settings > Phone > Call Waiting menu. It should be the same code for T-Mobile. On Verizon, using *43 will deactivate call forwarding, not call waiting; *42 will turn it back on.
Call trace allows you to dial the code *57 to trace the phone number of a call that was received. This service is used to trace harassing calls which warrant law enforcement or legal action. If you do not intend to take legal action, then an alternative is to use Call Return with *69.
The quickest method is to turn on Airplane Mode (or Flight Mode). This disconnects your phone from cellular networks, so callers hear a “not reachable” or “out of coverage” message. You can enable it from quick settings (swipe down on Android/iPhone).
🔐📞 ##002# instantly cancels all call forwarding on your phone — busy, unreachable, or no-answer. It's a simple way to reset settings and protect your privacy.
Do Not Disturb mode (DND) is your go-to solution for stopping incoming calls without having to block anyone.