VoLTE Roaming

Voice over LTE (VoLTE) can now be used outside Hong Kong. VoLTE Roaming Service allow csl customer connects voice calls through overseas partner’s 4G LTE network while roaming. We will extend our VoLTE Roaming Service coverage and let you start experience the speedy VoLTE call connection, try to provide the best roaming service and support you every step around the world.

No matter you are connecting with VoLTE Roaming Service or traditional roaming voice call, please use the following dialing method:
Dial <+> + + +
Example: When you want to call back HK while roaming, simple input “+852 ”
A free of charge voice reminder for how to dial will be played if you are using VoLTE Roaming Service

1. VoLTE roaming service allow csl customer connects voice calls through overseas partner’s 4G LTE network while roaming (“VoLTE Roaming Service”)
2. VoLTE Roaming Service is only applicable to csl postpaid service plan customers who are enabled to access to csl VoLTE service. Customer must register and activate IDD, Roaming, and use designated compatible device with specified system version in order to use VoLTE Roaming Service in designated areas with designated networks. For details, please visit https://www.hkcsl.com/en/roaming-coverage-and-charge/
3. VoLTE Roaming Service may not completely cover all locations within the periphery, depending on performance of 4G LTE networks run by local operators. Roaming service will automatically switch to 2/3G, or other technologies, in locations not covered by a LTE network.
4. Usage will be calculated on a per minute basis. Any usage of less than one minute will be counted as one minute.
5. VoLTE Roaming Service will be available first to personal account customers of csl. JOC/1C2N customers have not yet been available. We would timely update at our webpage. If customer has not registered for IDD and roaming services or has already applied for “barring of IDD or roaming voice service”, upon request on using VoLTE Roaming Service, it represents the customer agrees to activate IDD and roaming service and agree to “un-bar IDD and roaming voice service”.
6. In case of any dispute, the decision of CSL Mobile Limited is final.
7. In the event of any discrepancies between Chinese and English versions, the English version shall prevail.