What is an eSIM? 2025 Guide for Beginners

eSIM stands for “Embedded Subscriber Identity Module”, a small, non-removable chip that is fixed into the mobile’s hardware by the manufacturer. Unlike regular SIM cards, you cannot take them out or hold them.

eSIM holds all the vital information about the connection, such as phone number, carrier information, and plans. It can be reprogrammed, which means you can change the carrier anytime you want or activate any service. In 2025, many users are storing different profiles at once on their eSIM.

eSIM vs. Physical SIM: What’s the Difference?

As described above, eSIM is embedded in your device like a chipset, and it’s attached to the motherboard, making it impossible to take out. That doesn’t mean you can’t change numbers or carriers because the information on the eSIM is rewritable. To grasp the fundamental similarities and differences between an eSIM card and a physical SIM card, we need to find the similarities and differences between them.

Form Factor (FF)

Subscriber identity modules classify SIM cards into 1FF, 2FF, 3FF, 4FF, and MF2 form factors. Each generation of SIM cards is smaller than the previous one. 2FF stands for mini SIMs, 3FF stands for micro SIMs, and 4FF stands for nano SIMs. As a result, physical SIM cards fall under the following form factor. The eSIM is an embedded SIM that falls under the category of MFF2, which stands for the machine-to-machine form factor.

Network Switching

An eSIM, unlike a standard SIM card, does not require a physical card and may be linked to many network carriers. It essentially disconnects the client from the network operator, allowing switching carriers on the same phone easily. An eSIM is embedded into the phone via software, and your coverage is purchased through mobile networks.

Chip

An eSIM is an electronic version of the classic SIM card that is integrated directly onto the device’s motherboard during the manufacturing process, as opposed to a standard SIM that goes into the SIM tray inside your phone. It does not require a physical card and is surface-attached to the mobile device right out of the box. It functions similarly to an actual SIM card but without the need to insert a real SIM card into the slot.

SIM Profile

An eSIM may store up to five virtual SIM cards, letting you switch between carriers if you are somewhere with limited service. A traditional physical SIM card only stores one profile per client. However, an eSIM store’s several profiles for the same consumer is a significant advantage. An eSIM is a logical profile on your smartphone that may be reprogrammed.

An eSIM may store up to five virtual SIM cards, letting you switch between carriers if you are somewhere with limited service.

Benefits of eSIM

Having an eSIM, like having a phone with dual SIM card slots, allows you to have numerous phone numbers. The most significant advantage is that you can make and receive calls and texts with either number, making it easier to handle your incoming and outgoing communications.

As a result, they may be pretty practical for distinguishing between personal and professional communications. You may also use an eSIM with a traditional SIM card to customize your connectivity across devices.

The following are some of the advantages of an eSIM card:

• It is easier to activate than physical SIM cards.
• It makes switching network providers easier.
• You don’t have to disable accounts permanently.
• They consume less space on smartphones.

Disadvantages of eSIM

While there are plenty of advantages to using an eSIM card, there are certain disadvantages to it as well. Some of which are mentioned below:

• An eSIM takes longer to restore in a new phone.
• An eSIM allows you to be tracked more easily by network providers
• eSIMs are not entirely safe from fraud, and hackers can go to great lengths to hack vulnerable eSIM mobile carrier systems to get into users’ confidential data.

Is Your Device eSIM Compatible?

Most major brands have started using eSIMs on their mobile phones and tablets. Currently, the following phones and tablets are eSIM compatible:

Apple

Any iPhone after XS supports eSIMs, with iPads and Apple Watches providing the same option.

Samsung

Samsung flagship mobiles such as Galaxy S, Z Fold, Z Flip, and Note Series have an eSIM option. Samsung also introduced eSIM functionality in their mid-range phones, like A-Series models, in a few regions.

Google

All Google Pixel mobile phones from Pixel 3 featured eSIM.

Motorola (Lenovo)

Only flagship models by Motorola have an eSIM option; these are the Motorola Edge and Razr foldables.

Xiaomi

13 and 14 series, fold models, and Redmi Note Pro devices featured eSIM when they launched.

Conclusion

A SIM card is a chipset intended for convenience that also shapes the way we connect to the internet and other people’s mobile networks. It’s the name of the global connectivity and flexibility that has just transformed from physical to an embedded one.

Physical SIM cards are still in use, but their future is not so distant that they will become obsolete. Nevertheless, it’s good to see how technological advancements are paving the road for more convenience, where we could just do everything with an electronic device.

For those looking to get an eSIM for their mobile device, it’s recommended to pair it with a suitable VPN service that helps prevent the notorious forms of cyberattacks, such as hacking, data theft, phishing attacks, and many more.