Unlocking Your iPhone Using the Calculator

Unlocking an iPhone is typically associated with entering a passcode or using biometric authentication methods such as Touch ID or Face ID. However, did you know that there’s a lesser-known method to unlock an iPhone using the Calculator app? In this step-by-step guide, we will walk you through the process of unlocking your iPhone using the Calculator app.

Note: This method applies to older iPhone models running iOS 12 or earlier versions. Since Apple regularly updates its operating system, this method may no longer be applicable to the latest iOS versions.

Access the Calculator App

 Locate the Calculator app on your iPhone’s home screen. It usually appears as a simple calculator icon.

Enter an Incorrect Passcode 

Tap on the Calculator app to open it. Instead of performing any calculations, you’ll be using the Calculator’s passcode bypass functionality. Enter an incorrect passcode several times consecutively until you see a message stating, “iPhone is disabled, try again in X minutes.”

Access the Emergency Call Screen 

Tap on the “Emergency Call” button, usually located beneath the passcode entry field. This will bring up the Emergency Call screen.

Dial a Code 

On the Emergency Call screen, type the following code: *#812#. Make sure to enter the code accurately to proceed.

Return to the Calculator App 

After dialing the code, your iPhone should automatically switch back to the Calculator app, bypassing the passcode lock screen.

Access the Home Screen 

Press the home button or swipe up from the bottom (depending on your iPhone model) to access the iPhone’s home screen. Congratulations! You have successfully unlocked your iPhone using the Calculator app.

  • How can I unlock my iPhone if I forgot the passcode? 

If you’ve forgotten the passcode for your iPhone, there are a few methods you can try:

Use iTunes: Connect your iPhone to a computer with iTunes installed, put your device into recovery mode, and restore it. This will erase all data on your iPhone, but it will remove the passcode as well.

Use iCloud: If you have Find My iPhone enabled and linked to your iCloud account, you can remotely erase your device and remove the passcode. This method requires an internet connection.

Use Recovery Mode: Connect your iPhone to a computer with iTunes, put your device into recovery mode, and choose the option to restore it. This will erase your data but allow you to remove the passcode.

Is it possible to unlock an iPhone without a SIM card? 

  • Yes, it is possible to unlock an iPhone without a SIM card. You can set up and use your iPhone without a SIM card for various purposes such as accessing Wi-Fi, using apps, and browsing the internet. However, if your iPhone is carrier-locked, you will need a compatible SIM card from that carrier to complete the unlocking process.
Can I unlock my iPhone without using the iCloud account associated with it?
  •  If your iPhone is linked to an iCloud account, it is generally not possible to unlock it without using that account. Activation Lock, a security feature of iPhones, requires the linked iCloud account credentials to unlock the device. If you don’t have access to the iCloud account, it’s recommended to contact Apple Support or the original owner of the device for assistance.
What are the methods to unlock an iPhone that is locked to a specific carrier? 
  • To unlock an iPhone locked to a specific carrier, you can try the following methods:

Contact your carrier: Reach out to your carrier and request an unlock. They may have specific requirements and procedures to follow. This method is typically used when you’ve fulfilled the contract terms or paid off the device.

Use a third-party unlocking service: There are reputable third-party unlocking services available online that can help unlock your iPhone. These services usually charge a fee and require you to provide specific details about your device.

Hardware unlocking: This method involves using specialized equipment to modify the iPhone’s hardware. It is complex and usually not recommended as it may void your warranty and can potentially damage the device.

It’s important to note that carrier unlocking policies and procedures can vary, so it’s best to check with your specific carrier for accurate and up-to-date information on unlocking your iPhone.


While this method may seem unconventional, it can be useful if you forget your iPhone passcode and need to gain access quickly. However, it’s important to note that Apple regularly releases software updates to enhance security and fix vulnerabilities. Consequently, this method may no longer work on newer iPhone models or iOS versions. It’s always recommended to use official methods provided by Apple to unlock your iPhone or seek assistance from an authorized service provider if needed.

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