What is eSIM? Features, Benefits, Pros & Cons, Compatible Devices, Setup & Activation Guide, and How to Convert a Physical SIM to eSIM
eSIM is a new technology first introduced by Google in 2017. However, it only became widely popular after Apple adopted this technology on the iPhone XS, XS Max, and XR product lines.
So, what exactly is eSIM? Should you use eSIM? How do you use eSIM on different devices? What should you know before using eSIM?
The article below shares the most essential, practical, and updated information about eSIM to help you better understand this technology.
I. What is eSIM? Features
eSIM (embedded SIM) is a digital SIM integrated directly into a mobile device’s motherboard, allowing users to activate a mobile plan without using a traditional physical SIM card.
eSIM is significantly smaller than a physical SIM, measuring approximately 2.3 mm in length, 2.5 mm in width, and only 0.2 mm in thickness.
Setting up an eSIM is also much simpler than using a physical SIM. Instead of inserting or removing a SIM card, users only need to scan a QR code to install the eSIM on their device.
II. Advantages and Disadvantages of eSIM – Benefits for Users
eSIM offers many advantages, especially convenience and enhanced security compared to traditional SIM cards. However, like any technology, eSIM also has certain limitations.
1. Advantages of eSIM
- No physical SIM tray required: Since it is built into the device, there is no need for a SIM ejector tool, reducing the risk of losing or damaging the SIM card.
- Higher security: eSIM uses advanced security technologies, helping reduce the risk of hacking or information spoofing.
- Easy carrier switching: Users can quickly switch carriers and mobile plans without physically changing SIM cards.
- Supports multiple eSIMs: Multiple eSIM profiles can be installed on one device, although only one can usually be active at a time.
- Convenient for travel: Travelers can buy, install, and activate travel eSIMs online without visiting a store or waiting for a physical SIM delivery.
2. Disadvantages of eSIM
- Limited device compatibility: Only devices with built-in eSIM technology can use eSIMs. Most supported devices are newer smartphones and tablets from major brands. Compatibility may also vary depending on the market region.
- More difficult device transfer: Moving an eSIM to another device can be more complicated than swapping a physical SIM card, especially between different carriers.
- Device dependency: If the device is damaged, users may not be able to access the eSIM until the device is repaired.
- Fewer service providers: The number of reliable eSIM providers is still more limited compared to physical SIM providers in some countries.
Overall, both eSIMs and physical SIMs have their own pros and cons. However, eSIM stands out due to its convenience and flexibility. If your phone supports eSIM, it is worth trying this modern technology.
III. Can eSIM Be Used in Vietnam?
Yes. Vietnam is one of more than 200 countries and territories that support eSIM services. eSIM officially launched in Vietnam in 2018. Major carriers such as Viettel, VNPT, and MobiFone all provide eSIM services.
IV. Is eSIM Expensive?
Currently, eSIM usage mainly falls into two categories:
- Converting a physical SIM to an eSIM
- Using an eSIM while traveling abroad
For converting a physical SIM to an eSIM, Vietnamese carriers usually charge only around 25,000 VND per SIM.
For international travel eSIMs, prices are generally similar to physical travel SIMs, sometimes even cheaper, depending on the provider and data plan.
V. Should You Use eSIM When Traveling Abroad?
Yes. Instead of paying expensive roaming fees or searching for physical travel SIM cards, using a travel eSIM is often more convenient, secure, and cost-effective.
Users simply:
- Choose a reputable eSIM provider
- Select a suitable data package
- Complete payment online
- Receive an email with a QR code and setup instructions
The installation process usually takes only 3–5 minutes, and the eSIM automatically activates once the device connects to a supported network abroad.
VI. Devices Compatible with eSIM
Major brands such as Apple, Samsung, Oppo, Xiaomi, and Huawei have released devices supporting eSIM technology.
Supported devices include:
- iPhone: iPhone XS, XR, and newer models support eSIM.
- Samsung: Galaxy S20 series and newer, Note 20 series and newer, Galaxy Z Fold and Z Flip series.
- Oppo: Some flagship models like Find X3 Pro and Find X5 Pro.
- Xiaomi: Flagship devices such as Mi 11, Mi 12, and Mi MIX Fold.
- Huawei: Selected models such as P40 and Mate 40 Pro.
Note: eSIM compatibility varies by region. For example, many iPhones manufactured for the Chinese market do not support eSIM.
VII. How to Convert a Physical SIM to eSIM in Vietnam
Vietnam’s three major carriers — Viettel, VNPT, and MobiFone — support converting physical SIMs to eSIMs.
1. Viettel
Users can:
- Visit a Viettel Store directly
- Use the My Viettel app
Required documents:
- Original ID card or Citizen ID
- Existing Viettel SIM card
2. Vinaphone
Users need to visit a Vinaphone store with:
- Original ID card/Citizen ID
- Existing physical SIM card
Vinaphone also supports eSIM conversion via USSD:
- Dial
*091# - Select “Convert to eSIM”
- Follow the instructions on screen
3. MobiFone
Users can:
- Visit a MobiFone store
- Use the My MobiFone app
The process includes logging into the app, selecting “Convert to eSIM,” and following the guided setup instructions.
VIII. How to Install and Use eSIM
Installing an eSIM is quick and easy, typically taking only 3–5 minutes.
There are two common setup methods:
- Scan the QR code sent via email
- Enter the activation code manually
Important notes:
- Ensure your phone supports eSIM
- Maintain a stable internet connection during setup
- If using a travel eSIM, make sure your device is carrier-unlocked
eSIM Setup on iPhone
Users can:
- Scan a QR code
- Enter activation details manually
eSIM Setup on Samsung Devices
Samsung devices also support:
- QR code setup
- Manual activation code setup