Kích hoạt
Khi nào hiệu lực bắt đầu và cần làm gì khi đến nơi.
This section explains the step after installation is finished — turning on data roaming so the profile actually starts working on arrival — along with when a plan's validity period begins counting, and what to check if it is switched on but no signal appears. What is written here is kept separate from the installation steps themselves, which are covered specifically in the installation category.
If you have not yet installed a profile at all, the installation category answers that more directly. This page suits anyone who has already installed and is about to start using it for real, or who is wondering why data still is not working after switching it on.
How activation differs from installation
Installation is downloading the profile onto the device; activation is telling the device to actually connect to the live network through that profile. These two steps are deliberately kept separate, so a profile can be installed ahead of time without its validity period starting immediately, and switched on only once you are genuinely ready to use it.
In practice, activation usually means switching on data roaming for that profile in the settings menu, and setting it as the primary data route on arrival. Terms for when validity starts can differ by plan — some start counting the moment installation succeeds, others start on first real network connection — always check what is stated on your own plan's page.
Activation steps on arrival
- 1Switch the device on after landingGive it a moment to search for a local network before going into further settings.
- 2Go to the network settings menuOn iOS go to Settings > Mobile Service and select the installed eSIM profile. On Android go to Settings > Network & internet > SIMs and select the same profile. Exact wording differs by manufacturer and Android version.
- 3Turn on data roaming for that profileThis must be switched on separately from your main SIM, since roaming for the main SIM and for the eSIM profile are separate switches.
- 4Set this profile as the default data route if wantedIf you want the device to use this profile's data as the default during the trip, choose it in the same menu when selecting which SIM handles data.
- 5Wait for signal and testGive it a moment to catch the local network signal, then try opening a webpage or an app that uses the internet to confirm it genuinely works.
When the validity period starts counting
| Dòng máy | Counting begins at | What this means for you |
|---|---|---|
| Counts from successful installation | The moment the profile finishes downloading, whether or not it is actually activated | Best installed closer to travel day, not far in advance |
| Counts from first real network connection | When data roaming is switched on and the device first successfully connects to the local network | More comfortable to install well ahead of time, since counting has not begun until it is actually used |
Validity-counting models you may encounter
Any given plan may follow one of the models above. We do not assert a fixed number of days here, since it depends on the specific plan you bought — check the wording on the plan's own page or in your own order confirmation email for the clearest answer.
Activated but still no signal
| Symptom | Nguyên nhân khả dĩ | What to try |
|---|---|---|
| No signal bars at all | Data roaming for this profile is not yet switched on, or the device has the wrong SIM set as default for data | Check the network settings menu to confirm roaming for this specific profile is switched on |
| Signal bars appear but web pages do not load | Just connected and still needs a moment to settle onto a stable network | Wait a couple of minutes and try again, or toggle airplane mode off and on |
| An unfamiliar network name appears | The device connected to a partner network in the area, which is normal for roaming | Check whether the internet still genuinely works — if it does, the displayed network name is nothing to worry about |
Common problems after activation and how to respond
Can it be activated on more than one device at once?
No, it cannot — a profile is tied only to the single device it was first installed on. If you want it working on several devices, such as a phone and a tablet, a separate plan must be bought for each one.
That said, devices that support installing several eSIM profiles at once (while only running one at a time) can switch between different country profiles already installed on that single device, which suits frequent travellers visiting several countries.
Switching it off once home
Once back in your home country, it is worth switching off data roaming for the foreign profile and switching the default data route back to your main SIM, so the device does not keep trying to reach a foreign network unnecessarily.
- Turn on data roaming for this profile separately from the main SIM
- Set the profile as the default data route if you want it to be primary
- Wait a moment for the device to catch signal before concluding it does not work
- Check your own plan's page for its validity-counting terms
- Switch roaming for the profile off once you are back home
Confirming activation genuinely succeeded
Signal bars appearing on screen do not always mean activation has genuinely succeeded. A more reliable check is to open a webpage or an app that needs the internet, then watch whether the data-used figure in the settings menu starts to move. If that figure rises even slightly, the profile is genuinely sending and receiving data.
Some devices show a temporary label such as 'searching' or 'connecting' for a short while after the data-roaming switch is turned on, which is a normal part of pairing with a local network. Give it a moment before concluding something is wrong, then test again.
Installation and activation need internet differently
Installing a profile needs an existing internet connection, since the device has to download the profile data from a server. Activation, by contrast, is simply telling the device to search for a local network mast on its own, so Wi-Fi at the destination airport is not required to activate, as long as the profile was already installed beforehand.
A problem only arises if the profile has not been installed at all and the destination has no Wi-Fi available right away. In that situation, any internet access point needs to be found first, such as airline or terminal Wi-Fi, so the profile can finish downloading before it can be activated. This is exactly why installing ahead of time, while still at home, is worth doing.
Multi-country trips: switching profiles along the way
Devices that support installing several profiles at once usually still run only one at a time. When crossing into another country, the previous profile's data roaming needs switching off and the new one switched on instead, then checked that the new profile is set as the primary data route as well.
A commonly forgotten point is not switching in time, leaving the device still trying to reach the previous country's profile, which no longer has any signal to offer. A short personal checklist to switch profiles at every border crossing helps, rather than relying on memory alone.
| Step | Why it matters |
|---|---|
| Switch off roaming for the previous country's profile | Stops the device wasting time searching for a network no longer present in the new area |
| Switch on roaming for the new country's profile | Lets the device connect to the local partner network in the new area |
| Recheck the default data route | Confirms data flows through the new profile rather than the one just switched off |
What to redo every time a border is crossed
Activation menus vary by manufacturer and OS version
The exact menu name and where the data-roaming switch sits are not identical across every model, even within the same operating system, since each manufacturer adjusts the look of its own settings by version. The most reliable approach is to look at the network settings menu on your own actual device, rather than following steps written for a different model.
Still unsure? Contact the team
If waiting for signal, checking the data-roaming switch and restarting the device still leaves no data working, contact the team via LINE at https://lin.ee/skDPoNx (ID @esimonline) or by email at esimonline.asia@gmail.com, with your order number, device model and the country you are currently in, so the profile's status can be checked accurately.
The team replies in the order messages come in. Including full detail from the first message reduces back-and-forth and gets a faster answer.
- A rising data-used figure is firmer proof than signal bars alone
- Activation does not need Wi-Fi if the profile was already installed in advance
- Switch profiles every time a border into a new country is crossed
- Check the real menu on your own device, not steps written for a different model
- Contact the team via LINE or email if it still cannot be resolved
Câu hỏi thường gặp
Does activating later than the purchase date forfeit the plan?+
No, not as long as it is still within whatever window the plan allows for activation. Check the plan's page for whether there is a maximum time limit before it must be activated.
Do I need to switch off the original main SIM before activating the new profile?+
No, it does not need to be switched off. Devices that support dual SIM can run both at once — simply choose which SIM is the default data route in the settings menu.
Does using airplane mode during a flight affect the profile?+
No, it does not — airplane mode simply switches off every connection temporarily. Once airplane mode is turned off after landing, the profile remains fully intact and reconnects normally.
Why does the network name shown not match what I expected?+
A travel profile often connects through a local partner network, which may show a different name from the main operator you are used to. This is normal behaviour for cross-network roaming.
How many times can a profile be activated?+
The data roaming switch for the same profile can be toggled on and off as many times as needed, provided the profile has not been deleted from the device.
If I change devices mid-trip, does the profile still work?+
It will not work on a new device, since it is tied only to the original device it was installed on. In this case, a new plan would need to be bought for the new device.
Do I need to toggle airplane mode before activating?+
Not always — turning on the profile's data-roaming switch directly is usually enough. Toggling airplane mode on and off is simply a way to refresh the network search when signal has not yet appeared.
Does switching the main SIM back and forth mid-trip affect an already-active profile?+
No, it does not — the active eSIM profile keeps its status. Just check the default data route still points to that profile after switching the SIM back.
What if the wrong profile gets activated on a device holding several?+
Switch off roaming for the wrong profile, then switch on the one actually needed. It can be switched back and forth as needed with no downside.
Câu hỏi thường gặp trong mục này
Hiệu lực gói cước bắt đầu khi nào?+
Với gói tính từ lần kết nối đầu tiên, đồng hồ bắt đầu khi điện thoại của bạn lần đầu đăng ký vào mạng tại điểm đến. Với gói tính từ lúc mua, đồng hồ bắt đầu khi hồ sơ được cấp. Mỗi trang gói cước nêu rõ điều này ở dòng Kích hoạt, và đơn hàng của bạn lưu lại quy tắc đúng như tại thời điểm mua.
Dữ liệu còn dư có mất đi khi gói cước hết hạn không?+
Có. Dữ liệu dư không chuyển sang gói mới và không được hoàn tiền. Hãy chọn hiệu lực khớp với chuyến đi của bạn, và nếu sắp hết, hãy nạp thêm trước khi hết hạn thay vì sau đó.
Tôi cần làm gì ngay sau khi hạ cánh?+
1) bật dòng eSIM, 2) đặt dữ liệu di động cho dòng đó, 3) bật chuyển vùng dữ liệu cho dòng đó, 4) tắt chuyển vùng dữ liệu trên SIM gốc, 5) bật tắt chế độ máy bay một lần. Thông thường bạn sẽ có sóng trong vòng một đến hai phút sau khi tắt chế độ máy bay.
Hiệu lực gói cước tính theo múi giờ nào?+
Thời hạn hiệu lực theo đúng điều khoản của gói: tính theo giờ kể từ khi kích hoạt, hoặc theo ngày như nhà cung cấp quy định. Hãy kiểm tra trang gói và email xác nhận, vì với cách tính theo ngày, một chuyến hạ cánh lúc nửa đêm có thể âm thầm khiến bạn mất một ngày.
Tôi lỡ kích hoạt quá sớm. Giờ phải làm sao?+
Liên hệ chúng tôi ngay với mã đơn hàng và chúng tôi sẽ kiểm tra với nhà cung cấp xem có thể tạm dừng hoặc reset không. Nhiều gói không thể dừng lại sau khi đồng hồ đã bắt đầu chạy. Trong lúc đó hãy tắt dữ liệu của hồ sơ đó để không tiêu tốn thêm dung lượng, và không xóa hồ sơ.
Khi nào thời gian hiệu lực bắt đầu?+
Thường tính từ lần đầu hồ sơ kết nối vào mạng, không phải từ lúc mua hay cài đặt. Điều khoản ràng buộc là của riêng gói cước, được nêu trên trang gói trước khi thanh toán.
Điện thoại bị kẹt ở trạng thái tìm mạng sau khi cài đặt+
Bật chế độ máy bay trong mười giây, sau đó kiểm tra hồ sơ đã bật, được đặt làm đường truyền dữ liệu, và đã bật chuyển vùng dữ liệu cho hồ sơ đó.