Malaysia eSIM help: setup, fixes and straight answers
Everything about the Malaysia eSIM from this site: the setup at home, the switch after landing, the fixes and the refund rule.
- Install within 30 days
- Data roaming only if needed
- QR code right after payment
- Full refund if it does not work
The short answer
Install the eSIM at home on Wi-Fi before the flight. Once in Malaysia, switch it on and choose it for mobile data; if it will not connect, switch data roaming on for that line. When it does not work and no fix helps, the refund is full.
Checked October 2, 2026
What do you need?
Install the eSIM
Add the eSIM at home over Wi-Fi, no later than 30 days after the purchase.
OpenSwitch it on in Malaysia
Which toggles to change once you have landed, and in which order.
OpenData roaming
The one case where that toggle is needed, and where it sits.
OpenNot connecting
The checks, in the order to run them, then how to reach support.
OpenRefunds
What can be refunded, and how to ask.
OpenCheck your phone
Whether your phone can hold an eSIM: dial *#06# to find out.
Open
Set up your eSIM in four steps
Check your phone
The phone has to be unlocked and able to hold an eSIM. Dial *#06#: when an EID shows, both boxes are ticked.
Buy a plan
Pick the days and the data on the store: every plan names its Malaysian network, and the price in US dollars with tax is shown before you pay.
Install at home
The QR code from your order page goes on over Wi-Fi, no later than 30 days after the purchase. Right after payment the store shows that code: keep the page link.
Switch it on in Malaysia
Switch the line on and pick it for mobile data; if it will not connect, switch data roaming on for the eSIM line.
Coverage in Malaysia: what to expect
Malaysia has three mobile networks: Maxis, CelcomDigi and U Mobile. CelcomDigi was formed when Celcom and Digi merged in December 2022. Each network publishes its own coverage map, so check the map for the places you are going: the city you stay in, the road between towns, the island you visit. An eSIM for Malaysia runs on a Malaysian network, and that network's name appears next to the eSIM line once it connects.
Registration: the passport step for Malaysian prepaid SIMs
A prepaid SIM card bought in person in Malaysia is registered at the point of sale, and for visitors that means the original passport: U Mobile's registration guidelines for foreigners and tourists require the original and valid passport at registration. This eSIM is bought online and delivered as a QR code, and nothing on this site asks you for a passport in advance. If a plan carries a registration step, it is stated on the plan before you pay.
Troubleshooting
The QR code will not scan
Make sure the phone is on Wi-Fi, then try the scan once more from a second screen, or type the details in by hand from the order page. On a few phones the eSIM is added in the settings rather than with the camera.
It installed, yet no signal appears
Confirm the eSIM line is on, then toggle airplane mode for a few seconds. Give the phone a minute or two to find the network.
There is signal, but no data
Give the mobile data role to the eSIM line. When data still will not start, switch data roaming on for that line: that toggle is the store's stated fix for a line that does not start.
Data works, then stops
Look at your order page: when the plan's days or data are spent, the line may slow down or stop until the plan is over.
Data keeps running through my home SIM
Point mobile data at the eSIM line, and disable the setting that lets mobile data move between lines, so nothing falls back to your home line.
I deleted the eSIM by mistake
Before anything else, write to the store's support and include your order page link. A QR code can usually be used for one install only.
No connection even after every check
Write to the store's support with your order page link and your phone model while you are still in Malaysia. If it cannot be made to work, you get a full refund.
Sources
Where the facts on this page come from.
Still stuck?
Orders, QR codes and refunds are handled by VietSIM support. Write with the link to your order page and your phone model.
contact@vietsim.com
Quick answers
What does a plan name before I pay?
Its Malaysian network, the data and the days, that the plans carry data only, and its price in US dollars with tax.
Does the eSIM have a phone number?
No: the plans carry data only, and the store states that before you pay. Your own number stays on in your home SIM.
Should data roaming be on?
Only if the eSIM line will not connect, and only on that line: the store's own guidance points to this toggle when a line does not start. It stays off on your home line.
When should I install it?
At home, over Wi-Fi, no later than 30 days after the purchase. The line stays off until you land.
Can I use WhatsApp on my own number?
Yes. WhatsApp holds your number and draws its data from the eSIM.
Who answers if something goes wrong?
The store that took your payment. Its support wants your order page link.