Top 9 Essential Things You Need to Know About eSIM

Traditional SIM cards are linked to a specific carrier, but with eSIM, you can easily reconfigure it to work with various networks. Switching carriers is simple; you just need to reinsert the SIM and select your desired network.

Moreover, instead of replacing your SIM to use a different network, eSIM allows you to make the switch directly without changing anything physically—fast and convenient.

eSIM offers numerous advantages for both device manufacturers and users. One of the most obvious benefits is its tiny size—just a fraction of a nanoSIM. This makes eSIM perfect for products like smartwatches and other compact tech devices that have no room for a traditional SIM card. It's also a symbol of technology evolution: everything is getting smaller and more sophisticated.

As electronic components become more miniaturized and advanced, devices themselves will become even more modern. This highlights the importance of eliminating bulky physical SIM cards. By removing the SIM card, manufacturers can also eliminate the SIM card slot, tray, and associated components, creating more space for new features and enhancing device performance.

Additionally, eSIM's Remote Provisioning feature allows for a smoother user experience when activating and managing your phone. During setup, users can choose their network and data plan. At the 2018 Mobile World Congress, Thomas Henze, eSIM Program Director at Deutsche Telekom, demonstrated how to activate a phone simply by scanning a code sent from the carrier.

When traveling or working abroad, eSIM can automatically detect your new location and offer you a local number and plan suited to your destination. Another key benefit is that eSIM technology could help reduce production costs for future devices.

As discussed, eSIM features and benefits allow phones like the iPhone XS and XS Max to function without the need for a physical SIM card. Currently, not many carriers support eSIM, but with the global popularity of the iPhone, this is likely to change soon. Note that the iPhone XS and XS Max support both eSIM and physical SIM cards, and in the future, it may be possible to use two eSIMs simultaneously.

Additionally, Apple's website indicates that eSIM functionality won't be activated at the time of launch. Instead, the feature will be introduced via an iOS 12 update at the end of 2018 or early 2019. eSIM is not permitted in China, so Apple has created a version of the iPhone with two physical SIM cards for this market. When the iPhone XS and XS Max were launched, no Vietnamese carriers supported eSIM. However, recently, Vinaphone became the first carrier in Vietnam to offer eSIM, and users can now sign up for a trial at Vinaphone stores nationwide.

With a size of just 5x5mm, eSIM makes devices much smaller and lighter. It is particularly useful for future handheld devices. As electronic components continue to shrink and become more sophisticated, tech devices will keep getting more advanced. The more components added, the further these devices can go. You can certainly see the importance of eliminating bulky physical SIM cards.

Moreover, removing the physical SIM card also eliminates the SIM slot, tray, and electronic components that connect the SIM to the device. With this extra space, manufacturers can add more components, boosting device performance. Anything that benefits the device, obviously benefits us as consumers.

eSIM not only benefits smartphones, but also enhances other connected devices. Experts predict that in the coming years, the Internet of Things (IoT) will become a vast category, surpassing even mobile phones in terms of connectivity. eSIMs will enable these devices to perform better and minimize existing limitations.

Wearables and laptops are among the devices that stand to gain the most from eSIM technology. Additionally, eSIM could be integrated into vehicles, allowing multiple cars to connect through a single device.

eSIM is the future, but its widespread adoption will take time. Most smartphones still use physical SIM cards, and it will be a while before this changes. In the case of Google Pixel 2 and Pixel 2 XL, eSIMs are only used by Google’s Project Fi, with a physical Nano-SIM tray for other users.

The GSMA, a global association representing mobile networks, is working to standardize eSIM technology. Alongside Samsung and Apple, several major carriers have pledged to join the eSIM revolution. Over time, data currently stored on traditional SIM cards will gradually migrate to eSIM devices, although there will be a learning curve during the initial rollout and testing phases.

Another key advantage of eSIM is its ability to eliminate the need for local SIM cards when traveling abroad. Instead, local networks can temporarily assign you a local number and plan for the duration of your trip. In the current ecosystem of networks, devices, and SIM cards, each device requires a different SIM size. By replacing physical SIM cards with a tiny embedded version inside the device, everything becomes more convenient.

What is eSIM? eSIM stands for 'embedded Subscriber Identity Module,' essentially an electronic SIM. Unlike traditional physical SIM cards, eSIM technology is embedded directly into your device. It is a small chip used to authenticate your identity with your mobile network provider. With regular SIM cards, you need to swap them when traveling internationally or when switching carriers.

So, does eSIM mean you need to change your phone? Thankfully, the answer is no. One of the key advantages of eSIM technology is that it makes switching between networks much easier. It works with all devices and carriers, making the transition seamless. If you wish to use two SIM cards simultaneously, eSIM supports multiple accounts, allowing effortless switching between them.

The Google Pixel 2 was one of the first smartphones to support eSIM technology, and a dedicated eSIM management app was launched on Google Play. eSIM is also beneficial for making devices more compact and thinner. The Apple Watch Series 3 pioneered the use of eSIM, which helped Apple create sleeker devices compared to earlier models. More recently, the iPhone XS Max was released with dual SIM capabilities – one physical SIM and one eSIM – in several countries, although it has not yet launched in Vietnam.

It may take some more time before eSIM is fully equipped and widely available. Furthermore, eSIM technology will not only benefit users of mobile devices such as smartphones, tablets, smartwatches, and laptops, but it will also accelerate the deployment of 5G networks. eSIM is particularly useful for travelers, as it eliminates the need to worry about Nano or Micro SIM cards when changing devices, and you won't need the troublesome SIM ejector tool anymore. eSIM might also be integrated into the next generation of LTE-connected computers. These devices are just starting to emerge, but we expect to see more in the coming years.

The bright future of eSIM replacing traditional SIM cards is quickly approaching. Once your carrier supports eSIM and your phone is compatible, it will likely be time for you to start using this new technology. Currently, eSIM-enabled phones like the Google Pixel 2 and Pixel 2 XL still feature a Nano SIM tray, but in the near future, these trays could entirely disappear.

The first SIM cards were introduced in 1991, and they were quite large—at the time, they were about the size of a credit card. Over the years, SIM cards have become much smaller, thinner, and lighter. Now, eSIM represents the smallest and most advanced design available.

Measuring just 5x5mm, eSIM is directly soldered into the device's mainboard during production, and it functions like the current Nano SIM cards. It's undoubtedly the most modern innovation in SIM card technology today. Along with its smaller size, eSIM offers numerous advantages over traditional SIM cards.