Updated July 2026 · By the DiTrip team, a Taiwan-based eSIM provider
Key takeaways
- Most Taiwan eSIM problems are fixed by turning on Data Roaming for the eSIM line and toggling airplane mode.
- If there is still no data, select the carrier manually or check the APN setting.
- Install and label the eSIM before you fly, but only activate it after you land.
- A “no service” screen usually means the line is not enabled or roaming is off, not that the eSIM is broken.
- If nothing works, contact your provider; a good one replies fast and offers a money-back guarantee.
Your Taiwan eSIM will not connect, and you have just landed. Before you panic or head for an airport SIM counter, know this: the large majority of eSIM issues come from one of a handful of simple settings, and they take under a minute to fix. This guide walks through the exact steps in order, from the most common fix to the rarest, so you can get online fast. Work through them one at a time and you will almost always be connected within a couple of minutes.
Why is my Taiwan eSIM not connecting?
Almost every “not connecting” case comes down to a setting rather than a fault with the eSIM itself. The four usual culprits are: Data Roaming is switched off for the eSIM line, the eSIM line is installed but not enabled, the phone has not yet latched onto the local network after landing, or the wrong line is set as your mobile data. Occasionally an APN setting is needed. The good news is that all of these are quick to fix from your settings, and none require a new SIM or a trip to a store.
Fix 1: Turn on Data Roaming for the eSIM
This is the single most common fix. A travel eSIM connects to the local Taiwan network through roaming, so Data Roaming must be enabled for that specific line, even though it will not cost you home-carrier charges. Go into your mobile or cellular settings, tap the Taiwan eSIM line, and switch Data Roaming on. On many phones this alone brings you online within seconds. If you turned the eSIM on before landing and it did not connect, this is the first thing to check.
Fix 2: Toggle airplane mode or restart
If roaming is on but you still have no data, switch airplane mode on, wait about ten seconds, then switch it off. This forces your phone to search for and reconnect to the local network, which often resolves a stubborn connection right after landing. If that does not work, a full restart of the phone achieves the same thing more thoroughly. These two steps clear the majority of remaining issues and are always worth trying before anything more technical.
Fix 3: Select the network manually
Sometimes a phone does not automatically pick the right local carrier. Go to your mobile network settings, find Network Selection, turn off “Automatic”, and let the phone scan. Choose the carrier your eSIM uses (for example Taiwan Mobile or Chunghwa Telecom, depending on your plan). Manually selecting the network can immediately connect a phone that was otherwise stuck searching. Once connected, you can switch back to automatic selection for the rest of your trip.
Fix 4: Check the APN setting
Most eSIMs configure their APN automatically, but if you have data connection but nothing loads, a wrong or missing APN can be the cause. Your provider will tell you the correct APN for your plan. Go to your cellular settings, find the eSIM line’s Mobile Data Network or APN field, and enter the value your provider gave you. This step is rarely needed on modern phones, but it is the fix when the eSIM shows signal yet pages will not open.
Fix 5: Confirm the eSIM is enabled and set for data
Double-check two switches. First, that the Taiwan eSIM line is turned on, not just installed; an installed-but-disabled line shows no service. Second, that your mobile data is set to use the Taiwan eSIM rather than your home line. On dual-SIM phones it is easy to leave data pointed at the wrong line. Setting the Taiwan eSIM as your data line, with roaming on, resolves the “installed but no internet” situation that confuses many first-time users.
What does “No Service” or “SOS only” mean?
These messages look alarming but usually just mean your phone has not connected to a usable network yet. After landing, give it a moment, then run through Fixes 1 to 3: enable the line, turn on roaming, and toggle airplane mode. “SOS only” specifically means the phone can only reach emergency services, which resolves as soon as it latches onto the local carrier. It very rarely indicates a faulty eSIM, so work through the settings before assuming anything is wrong with the plan.
How do you prevent problems before you land?
A little preparation avoids most on-arrival stress. Install the eSIM on wifi a day or two before you fly, and label the line clearly. Confirm your phone is eSIM-compatible and unlocked with the *#06# check. Save your provider’s install email and any APN details offline, so you can reach them even without data. And leave the eSIM line switched off until you land, so it activates at the right time. Arriving with the eSIM already installed means the only thing left to do is flip two switches.
When should you contact support?
If you have worked through every fix and still have no data, it is time to contact your provider, and this is where a good one proves its worth. A local Taiwan provider with real support can check your plan status, confirm the correct settings for your device, and resolve issues quickly, often within minutes and in your timezone. DiTrip, for instance, offers fast local support and a 30-day money-back guarantee, so a genuine problem is either solved or refunded, never left to ruin your trip.
What if you had data and then lost it mid-trip?
Sometimes an eSIM works fine on arrival, then drops out days later. The usual causes are simple. First, you may have hit a daily or fair-use data cap, in which case speed is reduced rather than cut off, and it usually resets the next day. Second, your phone may have switched its data line back to your home SIM after a restart, so check that the Taiwan eSIM is still your active data line with roaming on. Third, you might be in a rare low-coverage pocket, such as a deep tunnel or a remote valley, where signal returns as you move on. Working through these three checks resolves almost every mid-trip drop, and none of them mean the eSIM has failed.
Are the fixes different on iPhone and Android?
The logic is identical, only the menu names differ. On iPhone, the key settings live under Settings then Mobile Service (or Cellular), where you enable the line, turn on Data Roaming and set your default data line. On Android, the same options sit under Settings then Network and Internet or Connections, then SIMs. Whichever phone you have, the order of fixes is the same: enable the line, turn on roaming, toggle airplane mode, then check network selection and APN. If you can find those settings, you can resolve the vast majority of eSIM issues on either platform without any technical knowledge.
Frequently asked questions
My eSIM shows signal but the internet does not work. Why?
Usually the APN is wrong or your data line is set to the home SIM. Check both, and make sure Data Roaming is on for the eSIM.
Do I need Data Roaming on, and will it cost extra?
Yes, turn it on for the eSIM line. It tells the phone to use the local network and does not trigger home-carrier roaming fees.
My eSIM did not connect the second I landed. Is it broken?
Almost never. Give it a moment, then toggle airplane mode. It usually connects within a minute or two.
Can I reinstall the eSIM if something went wrong?
Deleting and reinstalling can cause problems and some eSIMs cannot be reinstalled from the same QR code. Contact support before removing it.
What if I accidentally activated it before my trip?
Contact your provider. Support can advise on your plan’s activation window so you do not lose days.
Should I keep my provider’s contact details offline?
Yes. Save the install email and any APN details so you can reach help even before you are connected.
Will a VPN stop my eSIM from working?
No. A VPN runs on top of your data connection and does not affect the eSIM itself. If pages will not load while a VPN is on, turn it off briefly to confirm your eSIM data is working, then switch the VPN back on. The eSIM and the VPN are separate layers, so a connection problem is almost always in the data settings rather than the VPN.
Travel Taiwan with support that answers
A DiTrip Taiwan eSIM comes with fast local support and a 30-day money-back guarantee, so a hiccup is never a crisis. New customers get 10% off with code ditripgo2026: DiTrip Taiwan eSIM plans. New to eSIM? See our Taiwan eSIM installation guide.