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. For smooth data roaming via overseas networks, customers are advised to check here for the correct APN setting.
3. Make IDD calls while roaming
Different roaming destinations have different access codes for making IDD calls - eg China is 00 and US is 011.
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):
5. Preventing handsets from switching to roaming while in Hong Kong
Customers can take the action outlined below to prevent handsets from switching to mainland China-based mobile networks while in Hong Kong, thereby incurring unnecessary roaming charges.
i) Temporarily suspend roaming service.
Dial short codes to suspend roaming service & resume roaming service before leaving Hong Kong Please call our 24-hour customer service hotline at +85225123123 for short codes details
ii) Use your handset’s "manual network selection" mode to select the csl mobile service network