iPhone Secret Codes That Actually Work in 2026 (and the Ones That Don’t)

Search "iPhone secret codes" and you will find long lists copied from site to site, full of codes that do nothing on an iPhone. Many come from Android, some were retired by carriers years ago, and some never worked at all. Here are the ones that do work, and why the others do not.

I build Secret Codes: IMEI & Carrier, a free iPhone app with 317 verified dial codes, and the screenshots in this guide come from it. If you would rather tap than memorise codes, get Secret Codes on the App Store.

Which iPhone codes actually work?

Code	What it does
*#06#	Shows your IMEI (and EID on eSIM iPhones)
*3001#12345#*	Opens Field Test mode: detailed cellular signal information
*#21#	Checks whether unconditional call forwarding is on
##002#	Cancels all call forwarding (GSM networks)
*#43#	Checks call waiting status
*43# / #43#	Turns call waiting on / off
*#30#	Checks whether incoming caller ID (CLIP) is shown
*#31#	Checks whether your caller ID is hidden on outgoing calls (CLIR)
#31# + number	Hides your caller ID for that one call, on many GSM networks
*67 + number	Hides your caller ID for that one call, on US carriers

How a code behaves can depend on your carrier and country. Carriers can change or withdraw support at any time.

Why don't Android codes work on iPhone?

Codes like *#*#4636#*#* (the Android testing menu) or *#0*# (a Samsung hardware test) open menus built into Android. iOS has no hidden engineering menus, so these codes do nothing on an iPhone. The codes that do work on iPhone are either:

• GSM standard codes defined by 3GPP, such as *#06# and the call forwarding family, which every phone handles the same way.
• Carrier codes that your network handles, such as balance checks or voicemail shortcuts.
• Apple's Field Test code, *3001#12345#*.

What does Field Test mode show?

Dial *3001#12345#* and press Call. Field Test shows technical details about your cellular connection, such as the serving cell and signal measurements. On recent iPhones, signal strength is shown as RSRP in dBm. Values closer to zero are stronger: around -80 dBm is excellent, and below about -110 dBm is weak. It is useful for finding the best spot in your home for signal.

How do I use a code safely?

Open the Phone app, go to the Keypad, type the code and press Call. Codes that change settings, such as call forwarding, take effect immediately, so check what a code does first. Secret Codes never dials anything for you: tap Open in Phone and the code is handed to Apple's dialler already entered, so you decide whether to press Call.

What else does Secret Codes include?

• 317 codes, every one verified against a carrier's support page, Apple's documentation or the 3GPP GSM specification. Unverifiable and retired codes are left out.
• Built around your carrier: choose your network once, and each code says whether it is published for your carrier.
• 27 troubleshooting playbooks for No Service, dropped calls and porting.
• A full diagnostic suite: battery, storage, Wi-Fi, cellular, display, touch, cameras, sensors and Face ID.
• Spotlight, Siri and Shortcuts integration.
• Nothing locked: no paid tier and no subscription.

More guides you may find useful:

• iPhone Field Test Mode (*3001#12345#*): How to Check Your Real Signal Strength
• Android Secret Codes on iPhone: *#*#4636#*#*, *#0*# and What to Use Instead
• What Does ##002# Do on iPhone? Cancel All Call Forwarding (and Keep Your Voicemail)

How Secret Codes helps

• 317 verified iPhone codes, each checked against a carrier, Apple or the 3GPP standard. Android-only and retired codes are left out.
• Plain-English explanations of what every code does before you dial it.
• Open in Phone puts the code in Apple's dialler. Nothing is ever dialled for you.
• Built around your carrier: each code says whether your network publishes it.
• A full diagnostic suite for battery, storage, Wi-Fi, cellular, display, touch, cameras, sensors and Face ID.
• IMEI in one tap with Siri, Spotlight, Shortcuts and a Home Screen quick action.
• Free, with nothing locked: no paid tier and no subscription.

Download Secret Codes free on the App Store and keep every working iPhone code in your pocket.

More guides: how to check your IMEI, call forwarding codes, how to hide your caller ID and how to check if your iPhone is unlocked.