csl. - Manage mobile service

The new CSL app allows users to manage their mobile service plan and account, activate 5G roaming, enjoy convenient services and access limited-time offers.

Explore and manage your mobile service:

- Keep track of data and voice call usage, as well as roaming balance

- Check account balance, billing history, and set up automatic credit card payment

- Manage data usage for additional SIMs and share data-roaming pass entitlement

CSL customer offers and rewards:

- Receive coupons and limited-time offers through the "My Wallet & Rewards" feature

Discover the latest mobile models, service plans, and roaming options:

- Enjoy special pricing benefits when purchasing a standalone handset

- Access data top-ups, data-roaming day passes, and other value-added services

Roaming Tips

Become a roaming expert

Our roaming booklet provides info on mobile data and voice roaming plus other value-added services and useful tips.

1. Logon to an overseas network while roaming

While abroad, your mobile phone will select a network automatically. If your handset cannot connect to a local network, you can:

1. Power OFF and ON again.

2. Check handset setting to enable roaming: 

Flight mode = OFF

- means voice and data service in Hong Kong and while roaming are enabled

Data service = ON

- means data service in Hong Kong and while roaming is enabled

Data roaming = ON

- means data roaming is enabled

3. Go to "Setting" ->" Wireless and networks " ->" Mobile networks" -> choose "Network operators" -> your handset will list available networks -> then select a network

(manual network selection operations differ between handset models, so please refer to the manufacturer's user guide).

**Remember to Power OFF the phone or turn on "Flight mode" when on an aircraft to avoid roaming problems after landing. 

2. Handset APN [Access Point Name] setting for data roaming

Overseas networks may not support data roaming if a user's handset APN setting is incorrect or missing. Normal APN setting is: mobile

3. Make IDD calls while roaming

Access codes [+] and country code must be enter when making IDD calls.

4. Avoid unnecessary roaming charges

Cancel conditional call-forwarding feature before leaving Hong Kong

Activating conditional call-forwarding (busy, unreachable and unanswered) to any Hong Kong numbers while roaming will involve two IDD call-routing trips and incur double roaming charges, which could be avoided by canceling the conditional call-forwarding feature (press [##002#SEND]) before leaving Hong Kong.

Lock the keypad

To avoid accidental calls and unnecessary roaming charges, please remember to lock your mobile phone's keypad after use.

Browsing WAP (m.hkcsl.com) and assessing the Internet via mobile will incur data roaming charges

Free WAP (m.hkcsl.com) and Internet browsing included in any local WAP & Mobile Data Service package is NOT applicable while roaming overseas. Using these services while roaming will incur data-roaming charges based on usage volume.

Disable data roaming and cancel automatic updates/downloads for mobile apps before roaming

Customers using smartphones with automatic updates activated to install applications or download email will experience frequent data usage. To avoid unwanted data roaming charges, customers should disable data roaming and all automatic application updates before leaving Hong Kong. Please click here for simple disablement steps on certain handset models.

Steps how to disable the roaming data function

Using a mobile data service overseas will incur roaming charges. If you need to disable a handset’s data feature, please refer to the following steps (procedures and options may vary according to handset design): 

Android

IOS

Please note: Certain features and information are only available to CSL customers with a login account.