Every Secret Phone Code (iPhone + Android Master List)

This is the one from the video, and it is the single most important check. Open your phone dialer and enter the master interrogation code below, then hit call. Your carrier answers with the status of every forwarding rule on your line. You want every line to read Disabled. If it shows On and a phone number you do not recognize, every call and text to you is being silently copied to that number, and the person on the other end sees it all.

If it comes back clean, you are good. If it does not, jump to the wipe code in the next block, then the response playbook near the bottom.

If the master check showed forwarding you did not set up, this erases all call-forwarding rules on your SIM in one move, no menus, no per-rule digging. Enter it, hit call, wait for the 'erased' confirmations, then run *#21# again to confirm everything reads Disabled.

Harmless to run even if you are clean, it just resets forwarding to off.

Every phone has a unique IMEI, its serial number on the cellular network. You need it to report a phone stolen, to check a used phone against a blacklist before buying, or to unlock it. This code shows yours instantly and works on literally every phone, iPhone or Android, any carrier.

Knowing the attacker's move is how you recognize it on your own device. Unconditional call forwarding is set with a code shaped like **21* followed by a number and a #. Someone with 60 seconds of physical access to an unlocked phone types it in, and from that moment every call rings on their phone too. There is no notification, no icon, nothing.

That is exactly why *#21# exists as the counter-check, and ##002# as the undo. Only ever run forwarding codes on a phone you own. Setting forwarding on someone else's line without permission is illegal, this section is here so you can catch it being done to you, not do it to anyone.

These work on any GSM line (AT&T, T-Mobile, most of the world). A few behave differently or not at all on Verizon's older CDMA network, see the carrier section for that.

These manage the PIN on the physical SIM itself, the layer that stops someone popping your SIM into another phone. Handle with care, too many wrong PUK entries can permanently lock the SIM.

Your PUK is printed on the plastic card the SIM came in, or in your carrier account. If you lose it, your carrier can reissue it.

Android has its own layer of hidden codes, most in the *#*#...#*#* shape, that open engineering and test menus. Two big caveats: many are manufacturer-specific (these lean Samsung), and Google has disabled a lot of them on newer Android for security, so not every code fires on every phone. The GSM call-forwarding codes above (*#21#, ##002#) also work on any Android GSM line.

Treat the last two like live wires, *2767*3855# starts wiping the instant you press call, with no 'are you sure'.

Two things change by carrier: the exact strings for forwarding and account info, and whether GSM MMI codes work at all. Verizon grew up on CDMA, so the umbrella *#21# interrogation historically did not work there, you use the *72 / *73 vertical codes instead. AT&T and T-Mobile are GSM, so the codes above work as written.

These are vertical service codes, they work on essentially every US carrier and even landlines, no # needed. Dial the code right before the number where noted.

"Setting interrogation failed" on *#21#. The network could not read that forwarding condition. Usual causes: you are on a CDMA carrier (Verizon, old Sprint) that does not fully support GSM interrogation, Wi-Fi Calling intercepted the code, you are on a dual-SIM / eSIM phone and queried the wrong line, or one forwarding type (fax / data) simply is not provisioned. Fix: turn Wi-Fi Calling off, make sure you have real cellular signal, pick the right SIM line in Settings, then retry. Or check the conditions one at a time with *#61#, *#62#, *#67# instead of the umbrella *#21#.

"Connection problem or invalid MMI code." The string was mistyped, your carrier does not support that MMI, you are on CDMA, or Wi-Fi Calling swallowed it. Fix: retype it exactly (it is picky), turn off Wi-Fi Calling, confirm cellular signal, or use the carrier-specific star codes above.

Codes do nothing on Verizon. CDMA heritage, use the *72 / *73 style codes in the carrier table.

Field Test numbers look negative. dBm signal is negative, and closer to zero is stronger, -80 dBm is a great signal, -110 dBm is nearly no bars.

Dual SIM confusion. MMI codes only query the currently selected line, switch your default line in Settings if the results look wrong.

You ran *#21# and it showed forwarding to a number you do not know. Do this in order:

1. Run ##002# to wipe every forwarding rule, then *#21# again to confirm it all reads Disabled.
2. Change your SIM PIN with **04*, so your SIM cannot be moved to another phone.
3. Change your Apple ID / Google account password and turn on two-factor, forwarding is often the tip of a bigger access problem.
4. Check Settings for Wi-Fi Calling and any unfamiliar call-forwarding entries in Phone settings.
5. If it keeps coming back, someone has ongoing access, factory reset the phone and call your carrier to reissue the SIM.

Everything here is for checking and securing your own phone, or one you have explicit permission to test. The interrogation and wipe codes are safe on your own line. The forwarding-setup codes are not a toy, configuring forwarding or barring on someone else's phone without consent is illegal in most places. Save this, run the master check on your own phone, and send it to someone you care about so they can too.