What is an eSIM?

eSIM is a physical yet digital SIM. It is embedded into certain mobile phones, tablets and smart watches as a small electronic chip. A QR code provided by us enables you to activate the eSIM in a few easy steps, before connecting to 1O1O’s network.
You can swap the SIM card via settings, instead of inserting a new physical SIM card after removing the old one.
Existing customers using a physical SIM can change to an eSIM at one of our outlets.

Why an eSIM?

You can manage multiple eSIMs easily via “Settings”, which means you can separate SIM card usage – eg private or business.
You can keep a roaming SIM standing by, thereby removing the need to purchase a new one each time.
Unlike with regular SIM cards, no specific slot is required and there’s no way you can lose a card.


How do I activate?

Visit any 1O1O center to subscribe to a new number, port-in or replace an existing postpaid number on an eSIM. Scan the QR code following the device activation process. You can start enjoying service after the eSIM is activated.

eSIM Supporting models*

iPhone XS
iPhone SE (2nd generation or later model)
iPhone 12 mini (HK version)
iPhone 13 mini (HK version)

iPad Pro 12.9-inch (3rd generation or later model)
iPad Pro 11-inch (1st generation or later model)
iPad Air (3rd generation or later model)
iPad (7th generation or later model)
iPad mini (5th generation or later model)
Click here to learn how to activate iPad eSIM

Apple Watch:
Apple Watch (GPS + Cellular)(Series 3 or later model)
Apple Watch SE (GPS + Cellular)(1st generation or later model)
Apple Watch Ultra (GPS + Cellular)(1st generation or later model)
Click here to learn how to activate Apple Watch eSIM

Windows Device:
Microsoft Surface Pro X
Microsoft Surface Go 2 LTE
Microsoft Surface Go 3 Intel® Core i3 128 LTE
Microsoft Surface Pro 9 5G

Android mobile:
Samsung Z Flip
Samsung Galaxy Tab S9|Tab S9+|Tab S9 Ultra
Samsung Galaxy Tab S9 FE+|Tab S9 FE
Huawei P40
Huawei P40 Pro
Huawei Mate 40 Pro 5G
HONOR Magic 4 Pro
HONOR Magic 5 Pro
HONOR Magic V2
HONOR Magic 6 Pro
VIVO X100 Pro
VIVO X90 Pro 5G
Xiaomi 13 Pro
Xiaomi 13
Xiaomi 13T Pro
Xiaomi 13T
Xiaomi 14
Redmi Note 13 Pro+ 5G
Redmi Note 13 Pro 5G
OPPO Find N3 Flip
OPPO Find N3
OPPO Find N2 Flip 5G
OnePlus 11 5G
OnePlus 12 5G

Compatible Android Wearable Device:
Galaxy Watch (LTE)
Galaxy Watch Active2 (LTE)
Huawei Watch 2(eSim)
Samsung Galaxy Watch3 45mm (LTE)
Huawei Watch 3 Pro
Huawei Watch 3
Huawei Watch 4 Pro
Huawei Watch 4
Xiaomi Watch 2 Pro
Samsung Galaxy Watch4 Classic 46mm (LTE)
Samsung Galaxy Watch4 44mm (LTE)
Samsung Galaxy Watch5 40mm/44mm (LTE)
Samsung Galaxy Watch5 Pro 45mm (LTE)
Samsung Galaxy Watch6 Classic 43mm/47mm (LTE)
Samsung Galaxy Watch6 40mm/44mm (LTE)


* As of May 2024 in Hong Kong


eSIM set-up and activation on Android phones using QR code (example: Galaxy Z Flip)

Tap “Settings”

Tap “Connections”

Tap “SIM card manager”

Tap “Add mobile plan”

Tap “Add using QR code” / ”Add using activation code”

Scan the QR code from eSIM Voucher to register

Tap “Add” for new mobile plan

“Adding plan…” is shown

Tap “OK” for activate new mobile plan

After activation, you will see the new eSIM loaded and used


eSIM set-up and activation on Microsoft laptop/tablet using QR code (example: Microsoft Surface Pro X)

Click the Internet access icon and then right click the mobile data

Select “Go to Setting”

Select eSIM for mobile data and then click “Manage eSIM profiles”

Click “Add a new profile”

1. Select “Let me enter an activation code that I have from my mobile operator” and then click Next
2. Click “Next”

Scan the QR code or enter the activation code manually

Ensure the eSIM profile and then click “Yes”

Wait the eSIM installation completed

Close the tab

Check and click “Use” enable the installed eSIM profile, eSIM installation is finish


eSIM set-up and activation on iPhone using QR code (example: iPhone SE 2nd generation)

Select “Setting”

Select “Mobile Data”

Select “Add Data Plan”

Aim camera at network provider QR code

Select “Add Data Plan”

Change Label for Primary or Secondary number
(if need)

Choose which number for your Default Line

Choose which number associated with your Apple ID services

Choose which number for your default Mobile Data and enable fallback
(if need)

Your Data Plan are ready to use


One Number Service eSIM Subscription Steps for Android Watch

When customer starts the Other Wearables Service eSIM subscription process via the 1O1Oapp, the system will check whether the customer has completed Real-name Registration. If not completed, the system will send the customer a text message. By clicking on the SMS link, customer can submit his/her identity documents to complete Real-name Registration, upon successful Real-name Registration, he/she can subscribe Other Wearables Service eSIM immediately. If personal info needs updating before submitting Real-name Registration, review results will be sent by SMS or email within 3 working days. Please note you need to enter a one-time password to verify your identity as part of the self-subscription flow. For any enquiries, simply call our 24-hour Customer Service Hotline on 2888 1010.

Tap “My eSIM”

Enter mobile number, password.
Tap “Login”

Select “Other Wearables eSIM”

Tap "Add"

Enter one-time password
Tap “Submit”

Read and confirm T&C
Tap “Submit”

Scan QR code and download eSIM


Demo shows how to activate an eSIM into an Android watch: Galaxy Watch (LTE)

User can copy & paste the activation code onto “Galaxy Wearable” app. Tap Setting > Mobile network > Use Code > Got a activation code
and then input it there

User can “Share” the QR code to other device,
then use your SS-watch-paired device to scan the QR code via “Galaxy Wearable” app.

Pair up the Samsung Watch by “Galaxy Wearable” app
Tap “Watch settings

Tap “Mobile plans”

Wait for Samsung to look for server

Tap “Use code” to scan QR code

Scan the QR code generated from 1O1O App

Tap “Use plan”

Tap “Done”
Samsung Watch will auto-reboot
After reboot. Samsung Watch connects to the “Galaxy Wearable” app again




What is an eSIM?

It is a virtual SIM that allows you to activate a service provider’s mobile plan without using a physical SIM card.


How many mobile phones can work with one eSim number?

One eSIM number can work with only one eSIM device.


If I have two mobile phones, can I use them with the same eSIM?

No. eSIM for Android smart devices will only work with one smartphone.


Is there a charge for changing the eSIM for the second or multiple times?

Replacement arrangements are the same as if using a physical SIM. For more information, please call our customer service hotline on 2888 1010.


How do I choose the number for data?

Make sure you are using an eSIM-enabled Samsung device
Go to “Settings”
Choose “Connections”
Choose “SIM card manager”
Choose “Mobile Data” and select the plan you want to use for data


I have an eSIM-compatible device but it is not on your list of compatible devices. Can I still use eSIM service?

Your phone may not be compatible with our particular eSIM. For more information, please call our customer service hotline on 2512 3123.


Can I reuse the eSIM QR code on the same or other devices?

No. Once an eSIM voucher’s QR code is downloaded and installed, it will be invalidated immediately, regardless of device concerned.


I am an eSIM user, why can't I use "King King"?

King King works only when occupying a mobile device’s primary SIM slot and does not be compatible to the secondary SIM slot. Please note King King does not support using eSIM, which is defined as a mobile device’s secondary SIM.

Other Wearables One Number Service Terms & Conditions


Terms & Conditions

To use the Service you must have an eligible csl / 1O1O mobile service plan (“Service Plan”), a compatible “Device”, and a compatible Android 5.0 or newer mobile phone with 1.5GB RAM or above and iPhone which is iPhone 5 with iOS 9.0 or newer.
Data usage of the Service will be deducted from the Service Plan of your Service Plan.
You can make or receive calls from the Device using the mobile number of your Service Plan.
You can only use the Service with one Device at a time.  If you want to connect to another Device, you can connect your Device to the Service via “1O1O” / “csl” app on your mobile phone.  Alternatively, you can purchase an additional Service to use with the new Device on your mobile phone.
You can purchase up to a maximum of one Service under the same mobile number.
The Service does not support international roaming.
If you terminate the Service Plan of your mobile phone, you are required to terminate the Service of your Device by calling our customer service.
The Service is subject to the Mobile Service Agreement of CSL Mobile Limited, please visit
If there is any inconsistency between the Chinese and English versions of these terms and conditions, the English version shall prevail.
Terms & Conditions apply.