The correct APN settings allow your Taiwan eSIM to connect your phone to mobile internet. In most cases, the APN is configured automatically when the eSIM profile is installed. Manual setup is usually needed only when the phone shows signal bars but websites, maps and applications do not load.
For a NoveSIM travel eSIM, the required APN is data.esim. The username and password should remain empty unless the installation information for your specific plan states otherwise.
Before changing the APN, confirm that the Taiwan eSIM is turned on, selected for mobile data and allowed to use Data Roaming. An APN change will not solve the problem when the phone is still using your home SIM for internet.
Quick answer: Enter data.esim in the APN field, leave the username and password blank, save the profile and select it on Android. Then enable Data Roaming and refresh the connection by turning Airplane Mode on for 30 seconds.
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What Is an APN?
APN stands for Access Point Name. It is the mobile network setting that tells your phone how to connect to the internet through the eSIM provider.
The APN affects mobile data but does not control:
- Whether the eSIM is installed.
- Whether Taiwan is included in the plan.
- The amount of remaining data.
- The plan’s validity period.
- The local signal strength.
- Traditional calls or SMS.
An incorrect or missing APN can result in signal bars without working internet, unstable data or a connection that fails to start after arrival.
Correct Taiwan eSIM APN Settings
| APN Field | Required Value |
|---|---|
| Name | NoveSIM or Taiwan |
| APN | data.esim |
| Username | Leave empty |
| Password | Leave empty |
| Authentication type | Leave default |
| APN type | Leave default unless instructed otherwise |
| Protocol | Leave default |
| Roaming protocol | Leave default |
Do not add spaces before or after data.esim. Enter it exactly as shown.
When Should You Change the APN?
Check the APN when:
- The eSIM is installed and enabled.
- The phone shows a mobile signal.
- The Taiwan eSIM is selected for mobile data.
- Data Roaming is enabled.
- Internet still does not work.
You may also need to verify the APN if the connection worked previously but stopped after a software update, device restart or change to the active SIM.
When the APN Is Probably Not the Problem
The APN is unlikely to be the main cause when:
- The phone shows No Service.
- The eSIM profile is missing from the phone.
- Taiwan is not included in the plan.
- The plan has expired.
- The data allowance is fully consumed.
- The device is carrier-locked.
- The travel eSIM is turned off.
In these situations, first check the plan, installation, compatibility and network registration.
How to Set the APN on iPhone
On some iPhones, the APN is managed automatically by the eSIM profile and cannot be edited. If the menu is visible, follow these steps:
- Open Settings.
- Select Cellular or Mobile Service.
- Choose the Taiwan or NoveSIM line.
- Open Cellular Data Network or Mobile Data Network.
- Find the Cellular Data section.
- Enter data.esim in the APN field.
- Leave Username and Password empty.
- Return to the previous menu to save the setting.
After entering the APN:
- Confirm the Taiwan eSIM is selected under Cellular Data.
- Enable Data Roaming on the travel line.
- Disable Allow Cellular Data Switching.
- Turn Airplane Mode on for 30 seconds.
- Turn it off and test with WiFi disabled.
Why the APN Menu Is Missing on iPhone
The Cellular Data Network menu may be unavailable because the installed eSIM profile controls the APN automatically.
A missing menu does not necessarily indicate a problem. Instead, confirm:
- The correct eSIM is selected for Cellular Data.
- Data Roaming is enabled.
- The line itself is turned on.
- Cellular Data Switching is disabled.
- The plan includes Taiwan and remains valid.
Do not delete the profile to make the APN menu appear.
How to Set the APN on Samsung Galaxy
Samsung menu names can vary depending on the device model and One UI version.
- Open Settings.
- Select Connections.
- Open Mobile Networks.
- Select Access Point Names.
- Confirm that you are editing the Taiwan eSIM.
- Tap Add.
- Enter NoveSIM or Taiwan in the Name field.
- Enter data.esim in the APN field.
- Leave Username and Password empty.
- Open the menu and select Save.
- Select the newly created APN.
Creating the APN is not enough. You must also select it so the indicator beside the new profile becomes active.
How to Set the APN on Google Pixel
- Open Settings.
- Select Network & Internet.
- Open SIMs.
- Select the Taiwan eSIM.
- Open Access Point Names.
- Tap the option to add a new APN.
- Enter NoveSIM or Taiwan as the name.
- Enter data.esim as the APN.
- Leave Username and Password empty.
- Save the new access point.
- Select it as the active APN.
Restart the mobile connection after saving the profile.
How to Set the APN on Other Android Phones
The general path is usually:
Settings → Mobile Network → Taiwan eSIM → Access Point Names
Depending on the manufacturer, the menu may also appear under:
- Network & Internet.
- SIM Cards and Mobile Networks.
- Connections.
- Cellular Networks.
- Mobile Data.
Create a new profile, enter data.esim, save it and make sure it is selected.
APN Settings on Dual SIM Phones
On a Dual SIM device, make sure you edit the APN attached to the travel eSIM rather than your home SIM.
The recommended configuration is:
| Setting | Taiwan eSIM | Home SIM |
|---|---|---|
| Mobile data | Selected | Not selected |
| Data Roaming | Enabled | Disabled |
| APN | data.esim | Keep original settings |
| Automatic data switching | Disabled | |
Do not replace the APN of your regular operator with the travel eSIM APN.
Enable Data Roaming After Setting the APN
The correct APN alone is not sufficient. Travel eSIMs usually connect through partner networks, so Data Roaming must be enabled on the travel profile.
On iPhone
Settings → Cellular → Taiwan eSIM → Data Roaming
On Samsung
Settings → Connections → Mobile Networks → Data Roaming
On Google Pixel
Settings → Network & Internet → SIMs → Taiwan eSIM → Roaming
Keep roaming disabled on your home SIM to reduce the risk of charges from your regular operator.
Select the Taiwan eSIM for Mobile Data
If the phone continues using another SIM, changing the travel APN will have no effect on the active internet connection.
On iPhone
Settings → Cellular → Cellular Data → Taiwan eSIM
On Samsung
Settings → Connections → SIM Manager → Mobile Data → Taiwan eSIM
On Google Pixel
Settings → Network & Internet → SIMs → Mobile Data → Taiwan eSIM
Disable automatic mobile data switching so the phone does not return to the primary SIM.
How to Save a New APN on Android
A common mistake is leaving the APN screen without saving the new profile.
After entering the values:
- Open the three-dot menu.
- Select Save.
- Return to the Access Point Names list.
- Tap the new NoveSIM or Taiwan profile.
- Confirm that it is marked as active.
If you do not select it, the phone may continue using a different access point.
What to Do After Changing the APN
- Confirm the new APN is saved and active.
- Turn WiFi off.
- Turn Airplane Mode on.
- Wait 30 seconds.
- Turn Airplane Mode off.
- Wait several minutes for network registration.
- Open a webpage or map application.
If mobile data still does not work, restart the phone and repeat the test outdoors.
Signal Bars but No Internet
This is the situation most commonly associated with APN settings.
Check each item:
- The eSIM is turned on.
- The travel line is selected for mobile data.
- Data Roaming is enabled.
- The APN is exactly data.esim.
- The new APN is selected on Android.
- WiFi is disabled during testing.
- The plan still has data and validity.
Signal bars indicate that the phone can see or register on a network, but they do not confirm that the mobile internet configuration is complete.
No Service After Setting the APN
The APN does not normally control whether the phone shows No Service. That message points to a network registration, coverage or plan issue.
Check:
- You are already in Taiwan.
- Taiwan is included in the plan.
- The travel eSIM is enabled.
- The phone is carrier-unlocked.
- Network Selection is Automatic.
- The plan has not expired.
- You are not in a tunnel or weak-signal area.
The APN Keeps Disappearing
Some phones restore the settings supplied by the eSIM profile after a restart or network update.
If the APN disappears:
- Check whether internet now works automatically.
- Confirm the correct travel profile is active.
- Create the APN again if mobile data remains unavailable.
- Save and select the profile before leaving the menu.
- Restart the phone after completing the setup.
The APN Cannot Be Edited
An APN field can be locked when the profile controls its own network configuration.
In that case:
- Do not delete the eSIM.
- Keep Data Roaming enabled.
- Select the travel line for mobile data.
- Disable automatic switching.
- Refresh the connection with Airplane Mode.
- Contact support if internet remains unavailable.
Should You Reset Network Settings?
A full network reset should not be the first troubleshooting step. It may remove:
- Saved WiFi networks.
- WiFi passwords.
- Bluetooth pairings.
- VPN settings.
- Other network preferences.
First check the active data line, Data Roaming, APN and network selection. Use a full reset only after simpler steps fail and you understand what information will be removed.
Should You Delete and Reinstall the eSIM?
No. Do not delete the eSIM because the APN is missing or the connection is unavailable.
Many installation QR codes can be used only once. Removing the profile may prevent reinstallation with the same code.
Keep the profile installed while checking:
- The APN.
- Mobile data selection.
- Data Roaming.
- Network selection.
- Plan validity.
- Remaining data.
Can the Wrong APN Cause Slow Internet?
Yes. A missing or incorrect APN can cause unstable data, failed loading or an inconsistent connection. However, slow speed can also be caused by congestion, weak coverage or a plan’s high-speed threshold.
If the connection was fast and suddenly became slower, check usage before repeatedly editing the APN.
NoveSIM unlimited-style plans include 1GB of high-speed data in each 24-hour period. After the allowance is used, speed may be reduced until the next reset.
Does APN Affect Calls and SMS?
No. The APN controls mobile data access.
NoveSIM travel plans are data-only and do not include:
- A Taiwanese telephone number.
- Traditional voice minutes.
- Standard SMS.
Use WhatsApp, Viber, Messenger, FaceTime or another VoIP application for calls through the internet connection.
Does APN Affect WhatsApp?
The APN does not change your WhatsApp number. It only helps establish the internet connection used by WhatsApp.
Once mobile data works, WhatsApp should remain registered to your existing number and continue supporting messages, voice calls and video calls.
Does APN Affect Personal Hotspot?
Hotspot relies on the active mobile data connection. If internet works on the phone but not on connected devices, check whether the plan and device support tethering.
Also confirm:
- The travel eSIM is selected for mobile data.
- The APN is correctly saved.
- Personal Hotspot is using the travel line.
- Battery Saver is not restricting tethering.
Some phones provide a separate hotspot APN field. Enter data.esim there only when the device requires it.
APN Settings After Changing Phones
An eSIM profile generally cannot be moved freely between devices. Do not delete it from the original phone and try to reuse the QR code without checking first.
If you have a new phone:
- Confirm that it supports eSIM.
- Confirm that it is unlocked.
- Contact support before removing the original profile.
- Do not assume the installation code can be reused.
APN Settings After Installing a New eSIM
NoveSIM plans cannot normally be topped up or extended through the same QR code. A replacement plan comes with a new eSIM profile.
After installing the new profile:
- Label it clearly.
- Select the new line for mobile data.
- Enable Data Roaming.
- Check whether the APN configured automatically.
- Enter data.esim if manual setup is needed.
You need WiFi or another internet connection to install the new eSIM.
Fast APN Troubleshooting Checklist
| Check | Required Setting |
|---|---|
| Travel eSIM enabled | Yes |
| Selected for mobile data | Yes |
| Data Roaming | Enabled on travel eSIM |
| APN | data.esim |
| Username and password | Empty |
| New APN saved | Yes |
| New APN selected on Android | Yes |
| Automatic data switching | Disabled |
| Network Selection | Automatic |
Information to Send Customer Support
If internet still does not work, provide:
- Your order number.
- Your current location in Taiwan.
- Your phone make and exact model.
- Whether the phone shows signal or No Service.
- A screenshot of the active mobile data line.
- A screenshot of the APN settings.
- Confirmation that the APN is data.esim.
- Confirmation that Data Roaming is enabled.
- The network name displayed by the phone.
Do not publicly share your complete QR code, activation code or SM-DP+ information.
Related Articles
- eSIM Not Working in Taiwan
- Why Is My eSIM Slow in Taiwan?
- How to Use an eSIM in Taiwan
- How to Activate a Taiwan eSIM
- How to Install a Taiwan eSIM
FAQ
What is the APN for a Taiwan NoveSIM eSIM?
The APN is data.esim. Leave the username and password empty.
Do I always need to enter the APN manually?
No. Most phones configure the APN automatically. Enter it manually only when mobile data does not work or the profile instructions require it.
Why do I have signal but no internet?
The eSIM may not be selected for mobile data, Data Roaming may be disabled or the APN may be missing or incorrect.
Why is there no APN menu on my iPhone?
The installed profile may manage the APN automatically. Check the active mobile data line and roaming settings instead of deleting the eSIM.
Do I need to save and select the APN on Android?
Yes. After creating the new APN, save it and select it from the Access Point Names list.
Should Data Roaming be enabled?
Yes. Enable Data Roaming on the travel eSIM because it uses supported partner networks. Keep it disabled on your home SIM.
Will changing the APN affect my WhatsApp number?
No. The APN only controls mobile internet. WhatsApp normally remains connected to your existing telephone number.
Should I delete the eSIM if the APN does not work?
No. Keep it installed because the QR code may be single-use. Check all mobile data settings and contact support first.
Final Recommendation
Use data.esim as the APN for your Taiwan NoveSIM eSIM when manual configuration is necessary. Leave the username and password fields empty and keep other advanced values at their default settings.
On Android, save the new access point and select it as active. On iPhone, the APN may be controlled automatically and the editing menu may not appear.
After configuring the APN, select the travel eSIM for mobile data, enable Data Roaming and disable automatic data switching. Refresh the network by turning Airplane Mode on for 30 seconds, and do not delete the installed eSIM during troubleshooting.