What is stored on a SIM card?

SIM card stores the user's information, like International Mobile Subscriber Identity (IMSI), authentication key, phone number, and contacts. SIM is a small integrated card that helps networks access your device and allows you to make calls and texts. 

In this article, I will discuss the data stored on the SIM card and the steps to confirm which information is stored. Moreover, does the digital SIM offer more storage or not? 

Understanding the SIM Card

A Subscriber Identity Module (SIM) is the chip used in devices and stores the authentication data of the subscriber. When you insert the SIM card in the phone, it connects to the mobile network provider. 

The SIM has a unique number network that helps the provider identify you and ensure authorised access. Whether you have a physical SIM or an eSIM card, it acts as the bridge between the cellular network and your phone.  

What Information Is Stored on a SIM Card?

SIM cards store a critical type of data that contributes to ensuring smooth communication and security. 

1. International Mobile Subscriber Identity (IMSI)

International Mobile Subscriber Identity (IMSI) is the unique code that represents your account to the carrier. It is like your ID that helps the carrier to recognise your phone and enable you to make calls and access data. 

2. Authentication Key (Ki)

The authentication key is the code that ensures the authenticity of your network connection. It is stored on the SIM and improves the security of your mobile communication. 

3. Phone Number and Network Data

Phone numbers are also associated with the SIMs helps in identification on the mobile network. It also has Mobile Country Code (MCC) and Mobile Network Code (MNC) to locate your device and provide better signals. 

4. Text Messages and Contacts

Older versions of the SIMs also stored limited text and contact information. But now the latest phones have the cloud storage option, which frees the SIM from storage limitations. 

5. Personal Identification Number (PIN) and Security Data

Personal Identification Number (PIN) is the code that safeguards the SIM cards. It is like the authentication key that prevents your SIM from being misuse. 

Storage Capacities of SIM Cards

The physical SIM card storage capacity ranges from 8 KB to 256 KB, or up to 512 KB for some advanced eSIMs. There is enough space to store the network data, authentication credentials, a limited number of contacts, and SMS. 

The modern devices rely on internal or cloud storage to save large files, apps, and multimedia files. SIM is generally related to identification and security. 

How Do I See What Is Stored on My SIM Card?

Here are the steps you can follow to check what is stored on your SIM. 

For iPhone Devices

• Open the Settings app on your iPhone. 
• Tap Cellular and Cellular Data Option. 
• Here you can confirm the info on your SIM card. 

For Android Devices

• Open the Settings app on your phone. 
• Find the About Phone and click on it. 
• Here you can check your SIM status. 

How eSIMs Are Changing SIM Storage?

The latest eSIM technology stored data, including IMSI, authentication key, and network information, similar to the physical SIM but with format changes. The SIM works like traditional SIMs, but it looks different. Embedded SIM is integrated into the devices and can’t be removed. 

It digitally stores the user's information and offers enhanced security. You can activate the eSIM in your phone with a QR code scan. It is the ideal connectivity means for international travellers. 

If you are thinking of switching to eSIM for travel, Phonico is a reliable carrier that offers a variety of data plans. The plans include the unlimited talk and text services at cost-effective rates with no roaming charges. 

Conclusion

SIM card stores IMSI, authentication key, network information, SMS, and the contacts information. In contrast, the apps, photos, and personal files are stored in your phone's internal memory. 

The latest SIM technology, like eSIM, also stores the same information as a physical SIM card. In this article, I have discussed the details stored in your SIM. Understanding this information lets you protect your identity.

FAQs 

What’s not stored on a SIM card?

Photos, videos, internal history, apps, and email data are not stored on the SIM card. This information is saved on the device's internal memory. 

Will I lose everything if I take out my SIM card?

If you take out your SIM, nothing will happen to your personal data. Only a few SMS and contacts stored on the SIM will be lost. 

What can be tracked on a SIM card?

SIM cards can be tracked based on the unique IMSI identifier saved on your SIM. It lets mobile networks connect to the SIM card.