Mobile data or eSIM not working? How to fix it
Most of the time the cause is a single setting. Go through these in order and test the connection after each step.
Updated 9 November 2026
Fix these in order
Check that the eSIM is on
Open the phone's SIM settings and make sure the Reissaa eSIM is active. Also check that the plan has not expired and the data has not run out.
Turn on data roaming
This is the most common cause. A travel eSIM usually needs roaming switched on, so turn it on for the eSIM specifically.
Select the eSIM for mobile data
Make sure the phone is not trying to use data from your own plan.
Restart the phone
Or switch aeroplane mode on and off for a moment. The phone will search for a network again.
Choose the network manually
Turn off automatic network selection and try one of the networks listed in the plan details.
Check the APN
If the installation details include an APN setting, make sure it has been entered correctly.
What the problem means
| Situation | Likely cause | What to do |
|---|---|---|
| QR code will not scan | Weak connection, or the code has already been used | Switch to stable wifi and try again. If scanning still fails, enter the details manually (Enter Details Manually) if your order message includes them |
| Message: mobile plan cannot be added | The phone is carrier-locked, or the eSIM is already installed | Check that the eSIM is not already on the phone. If you cannot install it, do not keep trying; contact customer support |
| No network on arrival | Roaming is off, or the wrong network is selected | Turn on roaming and choose the network manually |
| Network shows but no internet | Data is on the wrong plan, or the APN is missing | Select the eSIM for data and check the APN |
| Internet suddenly slowed down | Data has run out or the daily limit has been reached | Check your data usage and buy more if the plan allows it |
Frequently asked questions
Does the plan's time run out if the internet does not work?
It depends on the plan: validity starts at purchase, at installation or at the first network connection. The plan details show which. If you cannot get the connection working, contact us and we will look into it.
Can I use my phone as a hotspot?
Usually yes. Hotspot use drains data faster, so keep an eye on your usage.
What if I have no internet and cannot install the eSIM?
Find wifi at a hotel, cafe or airport. This is why it is best to install the eSIM before you leave.
What does a data usage warning mean?
It is a reminder set on the phone that tells you data use has passed the limit you chose. It does not cut your connection. The real limit is the data amount of your plan, so you can ignore the warning or adjust the limit. Also make sure mobile data is set to the eSIM and not your own plan.
Does mobile data need to be on abroad?
Yes, if you want to use the internet without wifi. Turn on mobile data and roaming for the eSIM, and keep data roaming on your own plan switched off to avoid surprise bills.
Why is mobile data not working on my iPhone abroad?
The most common causes are the wrong data line or roaming being off for the eSIM. See steps 2 and 3 above or the iPhone guide: the eSIM's Data Roaming setting is under Settings → Mobile Data → Reissaa.
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