eSIM is short for Embedded SIM — a tiny digital chip soldered onto your phone's motherboard at the factory. Unlike a traditional plastic SIM, it can't be removed and swapped between handsets. Instead, you load a carrier "profile" onto the chip, and the phone treats that profile like any other SIM.

Because the chip is rewritable, you can store multiple profiles and switch between operators without juggling pieces of plastic. The technology is supported by most recent iPhone and Samsung models, as well as a growing number of laptops from brands like Dell and HP.

Experience ultimate connectivity with Kovitel eSIM, provided directly by Viettel, Vietnam’s strongest and most reliable mobile network.

With Kovitel eSIM, you enjoy a premium internet experience with zero bandwidth throttling. Unlike standard travel SIMs that slow down your speed after heavy usage, Kovitel guarantees unthrottled, lightning-fast data throughout your journey. You always receive priority network access, ensuring your connection remains stable, fast, and smooth even in crowded urban areas or during peak hours.

Backed by Viettel's superior infrastructure, Kovitel eSIM delivers unmatched nationwide coverage. You will stay connected everywhere—from bustling city centers to remote villages, deep valleys, and faraway mountainous regions where other networks fail.

Almost every flagship phone released from 2019 onwards supports eSIM. To be sure your specific model is covered, browse our eSIM compatibility list — it's kept up to date as new devices launch.

Five short steps and you're done:

1. Visit Kovitel.com
2. Pick the country or region you'll be travelling in, choose a data plan, and tap Add to Cart
3. Review your cart and proceed to Checkout
4. Fill in your details and complete the payment
5. Check your email — your QR code and setup instructions arrive within minutes

Kovitel data eSIMs are data-only — they don't come with a phone number for voice calls or SMS. If you still need calls and texts while travelling, keep your usual SIM enabled alongside the eSIM. Modern phones run both at the same time without any conflict.

No — no identification documents are required. You simply pick the plan, complete checkout, and we deliver the QR code to the email address you provide. That's the entire purchase flow.

Two quick checks in the Settings app:

1. Open Settings → General → About.
2. Scroll down to the Carrier Lock line. If it reads "No SIM restrictions", your iPhone is unlocked and free to use with any carrier.
3. Keep scrolling to find the Digital SIM (or "Available SIM") section. If you see a Digital SIM IMEI listed, your iPhone supports eSIM.

For Samsung Galaxy phones:

1. Open Settings → About phone → Status information.
2. Tap IMEI information.
3. If you see an entry labelled "IMEI (eSIM)", your phone supports eSIM.

For other Android phones:

1. Open the phone dialler and key in *#06#.
2. If your phone is eSIM-capable, you'll see an EID (eSIM Identifier) listed alongside the standard IMEI number.

We recommend buying it before you depart. That gives you time to install the profile while you're still on familiar home Wi-Fi, so when you land all you have to do is switch the line on — no fumbling around for airport Wi-Fi while you're jet-lagged and trying to find a taxi.

No problem — get in touch with our support team and reference your order number. We'll update the email on file and resend your QR code and setup instructions to the correct address.

Best practice is to buy the eSIM ahead of time and install it on your phone around one day before you travel. Keep in mind that for most plans, the validity window begins the moment you install the profile and connect to the network — so installing it days in advance can eat into your usable days.

Installation steps vary slightly depending on your phone. Take a look at our full installation guide, which has device-specific walkthroughs for iPhone, Samsung Galaxy, and Google Pixel — each with both the QR-code method and the manual entry method.

Each platform handles APN setup differently:

iPhone / iPad:

1. Open Settings → Cellular (or Mobile Data).
2. Tap your eSIM line, then Cellular Data Network.
3. Type in all APN values supplied by your provider.

Samsung Galaxy:

1. Go to Settings → Connections → Mobile networks → Access Point Name.
2. Tap Add in the top bar.
3. Enter the APN details and save.

Google Pixel:

1. Go to Settings → Network & internet → SIMs.
2. Tap your eSIM, then Access Point Names.
3. Tap the + button in the top bar and fill in the APN values.

This error usually traces back to one of two issues:

• The QR code is damaged, blurry, partially hidden, or cropped.
• Your phone's camera is having trouble reading the image.

What to try:

• Wipe the camera lens and try scanning again with the code at a slightly different angle or distance.
• If scanning still fails, switch to the manual entry method — copy the SM-DP+ address and activation code from your email and type them in directly.
• Still stuck? Reach out to support and we'll send a fresh activation profile.

This message means the QR code's unique activation code has already been consumed. The eSIM profile may have been installed earlier on this device, on a different device, or by someone else. Before contacting us, double-check whether the profile is already sitting on your phone:

• iPhone: Settings → Cellular → Cellular Plans
• Android: Settings → Connections → SIM card manager

If the profile isn't there, get in touch with support and we'll investigate.

This message typically appears for one of two reasons: your phone is a CDMA-only model, or it's still locked to its original carrier. eSIM only works on unlocked phones with GSM support.

How to check if your phone is locked:

1. Dial *#06# on the phone keypad to retrieve the 15-digit IMEI number.
2. Look the IMEI up on a service such as imeipro.info, imeicheck.com, or imei.info.

If the lookup reveals your phone is locked, contact the carrier that originally sold it and request an unlock. If they're unable to help, you'll need to use a different unlocked phone with the eSIM.

A few possible causes:

• Your phone has reached its eSIM storage limit.
• The same eSIM profile is already on this phone or on another device.
• The internet connection during setup was too weak or unstable.

What to try:

• Check how many eSIMs are stored and remove any old profiles you no longer use — our installation guide has step-by-step removal instructions for iPhone, Samsung, and Pixel.
• Confirm the profile isn't already installed (Cellular Plans on iOS, SIM card manager on Android).
• Switch to a more stable Wi-Fi network and try the installation again.