Secret iPhone codes simplify troubleshooting (2024)

Last fall, we told you about Apple's iPhone Signal Strength Placebo, an iPhone code that helps diagnose problems connecting to AT&T's 3G network. Dialing *3001#123456#* and pressing "Call" starts a field test on your iPhone with results that can be used, for example, to gauge signal strength. (It also offers a slew of other information probably beyond your comprehension unless you happen to be a cellular engineer.)

Secret iPhone codes simplify troubleshooting (1)

While the above code above is the iPhone's most useful, there are a number of other interesting codes, many posted at According to the site:

Most cellphones use special "diagnostic codes"--numbers that can be dialed to display various technical information about the unit, the user's account, the cellular network it's "registered" on, or the local network that's currently available. You might have dialed a few of these already while on the phone with tech support. ... Some of these may work your non-iPhone phone. Some are AT&T- or North-America-specific. The only way to know if they work on your phone is to try.

We tried each of the below codes and included sample screenshots of the results:

Dial *#06# if you need to know your iPhone's IMEI, the unique identifier (i.e. serial number) for your cell phone hardware. The IMEI, along with your SIM, identifies your iPhone to your service provider.

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Dial *777# and press Call checks your prepaid account balance.

Dial *225# and press Call checks your bill balance for a postpaid iPhone.

Dial *646# and press call checks your minutes for a postpaid iPhone.

Secret iPhone codes simplify troubleshooting (4)

Dial *#21# and press Call shows the status of call forwarding for voice, data, fax, sms, sync, async, packet access, and pad access call forwarding enabled or disabled.

Dial *#30# and press Call shows whether you have enabled or disabled the presentation of the calling line, presumably the number of the party placing the call.

Dial *#76# and tap Call shows whether the connected line presentation is enabled or disabled.

Dial *#43# and tap Call and show the call waiting status for voice, data, fax, sms, sync data, async data, packet access and pad access. Each item is either enabled or disabled.

Secret iPhone codes simplify troubleshooting (5)

Dial *#61# and tap Call to show the number for voice call forwarding when a call is unanswered. Also show the options for data, fax, sms, sync, async, packet access and pad access.

Dial *#62# and tap Call is the same as above except for no-service rather than no-answer scenario.

Dial *#67# and tap Call checks the number for call forwarding when the iPhone is busy.

Dial *#33# and tap Call checks for call control bars by checking all the usual suspects (voice, data, fax, sms, etc) to see whether barring is enabled or disabled for outgoing.

Did you find these codes to be useful? Do you know of any other codes not listed here? Let us know in the comments below.

Secret iPhone codes simplify troubleshooting (2024)


What is the master code to unlock any iPhone? ›

The fact is, there is no universal master code to unlock any iPhone. If you can't remember your iPhone, iPad, or iPod Touch password, you should try other ways we have listed above.

What is the *#30 code on an iPhone? ›

Sometimes, due to errors, your recipients may not see your caller information. To resolve such issues, iPhone allows users to solve it using secret codes. Simply type *#30# to check if your call line presentation is enabled or disabled.

What is *# 33 code on iPhone? ›

iPhone IMEI code: *#06# Gives you the phone IMEI which is your phone identifier for the hardware of your phone. iPhone configuration code: *# 33# This code will allow you to check a number of configurations on your phone for your calls, SMS, and data.

What is the secret iPhone setting everyone should know? ›

Open Settings, scroll down to “Accessibility,” find “Touch,” scroll all the way down and tap “Back Tap.” You'll see two options: “Double Tap” and “Triple Tap.” Each lets you tell your phone to do something when you tap its back twice or three times.

What is the default code to unlock an iPhone? ›

No, there is no default passcode on the iPhone. It is setup by the user. If you are using Two-factor authentication however it will want a six-digit code.

What is the emergency code for unlock iPhone? ›

Hold the power button for about 3 seconds and click the "Emergency Call" before the "Slide to turn power off" appears on the screen. Then, your iPhone will be unlocked.

What does *3370 do on iPhone? ›

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.

What happens when you dial *3001 12345 #* on an iPhone? ›

*3001#12345#* followed by the Call button. This should take you to the field test display and give you several options such as your SIM info, serving cell measurements, and your connected mode. Once in this mode, follow the steps below to find the most relevant information to your signal strength.

What does ##002 do on iPhone? ›

Dialing ##002# deactivates any conditional or unconditional call forwarding settings on your account and also deletes any data such as messages or voicemails that were previously diverted to another number.

What is the hidden key on iPhone? ›

Go to Settings > Accessibility > Touch, and tap Back Tap. Tap Double Tap or Triple Tap and choose an action. Double or triple tap on the back of your iPhone to trigger the action you set.

What is the secret code of iPhone? ›

Some common iPhone secret codes include: ##001127#: Resets your iPhone's network settings. ##872563#*: Resets your iPhone's diagnostic mode. *3001#: Opens the Field Test menu.

Is there a universal unlock pin for iPhone? ›

Each iPhone passcode is unique to the device and user, so you cannot use a master code to unlock any iPhone. But don't worry, there's still hope! You can always try to guess the passcode and unlock the iPhone fair and square. Most people have easy combinations like 123456 or 000000, which are easy to guess.

What is the master code to unlock all phone? ›

There are two master PIN codes known to work on certain older Android models: *#*#7780#*#* and *2767*3588#. *#*#7780#*#* is widely considered to be the master code to unlock any button phone. However, these codes have limited effectiveness and might not be compatible with newer Android devices.

How can I unlock my locked iPhone? ›

Unlock the iPhone From the Lock Screen
  1. Input the password incorrectly five times on the lock screen until "Forgot Password" appears.
  2. Select "Forgot Password" and then "Start iPhone Reset."
  3. Sign out of your Apple ID and tap "Erase iPhone" to initiate the factory reset process.

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