Roaming Voice Services

SUN Mobile Roaming Voice Services - Stay Connected with the World, Always Online

Wherever you are, staying connected through calls is crucial. SUN Mobile provides you with high-quality voice roaming services covering the globe, allowing you to keep in close contact with family and friends at all times while abroad.

VoLTE Roaming Service
The VoLTE roaming service allows customers to connect voice calls via the local roaming network provider's 4G LTE network while roaming. We will continue to enhance VoLTE roaming service coverage and high-speed voice call connections, committed to providing you with the best experience as you roam worldwide.

How to Use Roaming Voice Services

Calling Back to Hong Kong

Input the "+" key, then input "852", and finally input the complete "Hong Kong number", and press "Call". Example: +852 91234567.

Calling Overseas Numbers

Input the "+" key, then input the "Country Code" and "Area Code (if any)", and finally input the complete "Phone Number", and press "Call".

Calling Local Mobile Numbers

If you need to dial a local mobile number in the country/region you are in, simply input the "Local Number" without adding "+" or "Country Code".

Calling Local Landline Numbers

If you need to dial a local landline in the country/region you are in, you must input the local "Area Code (if any)", then input the complete "Landline Number", and press "Call".

Network Coverage and Charging Reference

We have covered major travel destinations for you. Voice roaming charges are calculated per minute, with any part of a minute counted as one minute.

Video Call Roaming Service

Voice Call Roaming Service

Frequently Asked Questions

Application and Preparation
- Q1: When traveling abroad, do I need to apply for or activate international roaming service in advance?
  A1: Yes, we recommend that you register and activate the international roaming service in advance before departing abroad to ensure your phone can be used immediately at the destination. Please bring your Hong Kong ID card to any of our stores to apply. If you have already opted for auto-pay, the $500 roaming service deposit can be waived.
- Q2: When traveling in Mainland China/Taiwan/Asia, can my Hong Kong mobile phone directly use roaming call services?
  A2: Yes. Our international roaming service covers many popular travel countries. You just need to confirm the service is activated before leaving Hong Kong. Upon arrival in Mainland China, Taiwan, or other popular Asian travel destinations, your phone will automatically connect to the local network provider.
- Q3: How can I check if my mobile number has international roaming activated?
  A3: You can check through the following methods:
  - Log in to our official website or mobile app "My Account".
  - Call our free customer service hotline 1728988 within Hong Kong or inquire at any store.

Overseas Calls and Emergency Services
- Q4: While roaming abroad, how do I correctly make a call back to Hong Kong?
  A4: No matter which country you are in, when dialing a Hong Kong number, please input the "+" symbol, followed by the country code "852", and finally the Hong Kong phone number.
  - Dialing Example: +852 91234567
- Q5: While traveling overseas, how should I dial local emergency services (e.g., police/ambulance) or the Hong Kong customer service hotline?
  A5: To call SUN Mobile Hong Kong customer service hotline: Please dial +852 1728988 (Please note, calling from overseas will be subject to IDD or roaming voice charges from the local telecom provider).
  - To call local emergency services: Please directly dial the emergency service number of the country/region you are in.

Connection and Troubleshooting
- Q6: After arriving in the destination country, will my phone automatically connect to the roaming network? What should I do if it cannot connect?
  A6: Usually it will connect automatically. Your phone will automatically search for and connect to our partnered local telecom network. If your phone fails to connect automatically or cannot receive a signal, please try the following steps:
  - Restart your phone.
  - Go to your phone's settings and try manually selecting a network.
- Q7: When roaming abroad, I cannot use mobile data to access the internet. Do I need to set up APN?
  A7: Generally, you do not need to manually set up APN (Access Point Name). If you cannot connect to mobile data, please check if the "Data Roaming" feature is enabled in your phone settings. Only in very rare cases would you need to manually set the APN to "mobile".

Charges and Fee Calculation
- Q8: Will answering incoming calls while roaming abroad incur additional charges?
  A8: Yes, it will. According to the mechanism of international roaming services, while you are roaming abroad, both making outgoing calls and answering incoming calls will be charged at standard roaming call rates.
- Q9: If I directly reject an incoming call (press the reject button) while roaming, will I be charged?
  A9: Yes, this action will incur charges. While roaming abroad, when you press the reject button on your phone, the call may be forwarded to your voicemail or another number. This action is considered as a connection and will therefore incur a forwarding charge. It is recommended that if you do not wish to answer, let the phone ring until it hangs up automatically.