This article provided by MiniTool Tech primarily discusses aspects related to mobile phone SIM card cloning, particularly focusing on the steps involved in the cloning process. You can easily learn the method through the textual instructions along with a video tutorial.

Note: Cloning SIM cards is prohibited by law in most countries and regions. However, there may be instances where you need to clone your own SIM card for specific reasons, such as preserving the features of a phone. Only if your phone cloning does not harm others or violate the law, you might proceed with it.

About SIM Card

A SIM card, or Subscriber Identity/Identification Module, is an integrated circuit designed to securely store the IMSI (International Mobile Subscriber Identity) number and its associated key (K_i). The K_i, a 128-bit value, enables the operator to recognize the mobile number and authenticate the SIMs.

The SIM card serves as the intermediary for transmitting signals between the phone and the tower. The IMSI and K_i are linked to your mobile numbers, which the operators store in their extensive databases. Using these secret keys, SIM cards facilitate billing for you.

What Can a Cloned SIM Card Do?

In addition to retaining the features of the original SIM card, cloning a SIM card can also enable sharing a phone with family members to avoid purchasing a second line; or, it can be used to spy on others' calls and data transfers, causing their phone bills to skyrocket. Most importantly, it can intercept conversations and data of the original SIM card.

Can You Clone a SIM Card?

As mentioned earlier, cloning a SIM card involves copying the IMSI and Ki codes of the SIM card. By extracting these two secret codes from the SIM card and programming them into a new blank SIM card, you can clone a SIM card. Since operator authentication on the SIM card relies on these values, it allows you to deceive the operators into believing the cloned SIM card is the original one. This is a flaw in the GSM technology.

So, which SIM cards can be cloned? Not all SIM cards can be cloned. SIM cards are manufactured using three algorithms: COMP128v1, COMP128v2, and COMP128v3. Currently, only the COMP128v1 version of SIM cards can be duplicated. This is also the algorithm used by most phones on the market.

How to Clone a SIM Card?

The primary goal of SIM card cloning is to obtain the IMSI and Ki codes, which are the identifiers of the SIM card and help you register your cell phone with the network.

For preparation, you need to buy a SIM card cloning device (blank programmable SIM card), purchase a SIM firmware reader or writer, download and install a SIM card reader software (e.g., MAGIC SIM, MOBILedit, and Woron Scan) on your computer, and acquire a SIM card cloning software (e.g., Data Doctor Recovery – SIM Card and SIM-EMU).

Step 1. Remove the original SIM card from the handset, place it into the card reader, and insert the card reader into the USB port of your computer.

Step 2. When the card reader is detected by your machine, launch the reader program and click the "read from the card" option in the reader program. The option varies depending on the reader program.

Step 3. Once your card reader software is connected with the physical reader, you should select the option for cracking the SIM card.

Step 4. After the cracking process is complete, save the cracked information into a file on your local computer. Below is a video demonstrating how to use MAGIC SIM to clone a SIM card information.

Step 5. Disconnect the reader program from the physical reader, remove your original SIM card from the physical card reader, and reinstall the original SIM card back into your phone.

Step 6. On your phone, unlock the original SIM and it will prompt for an unlock code. Contact your network provider and provide all the necessary information they require to unlock your SIM card, including your phone number, account details, name, security code, and the reason for unlocking the SIM. For the unlock reason, you should provide a reasonable and lawful explanation instead of informing your network provider that you are cloning your SIM card.

Additionally, read: Confused by SIM Card Not Provisioned Error? Check Here

Step 7. Then, your network provider will provide you with the SIM unlock code. Enter it on your phone and your original SIM will be unlocked.

Step 8. Connect the blank SIM card to your computer and open your SIM card cloning kit/application.

Step 9. Attempt to connect the clone program with the blank SIM. You will fail since the blank SIM has nothing inside.

Step 10. Then, use the SIM cloning software to write the extracted and saved file on your computer (.dat) to the blank SIM card.

Step 11. Once the writing process is complete, it will request a security code. Enter the security code provided by your network provider. Complete the SIM card cloning process and exit the program.

Related Article: Your Phone App Adds Support for Dual SIM Devices

By now, you have successfully cloned your SIM card. When you insert the cloned SIM card into another mobile phone, it will function. In the future, when someone calls you, both phones will ring, but you can only answer from one phone while the other will fail to be answered.

Also, if you make two calls simultaneously, only one of them will connect successfully. However, for text messages, both devices will receive them.

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