Mobile Internet Setting

Essential for International Roaming: iOS and Android Phone Setup Tutorial

When traveling or on business trips abroad, maintaining internet connectivity is crucial. Follow a few simple steps to easily set up your mobile data roaming, ensuring you stay connected wherever you are overseas.

iOS (iPhone) Mobile Data Roaming Setup Tutorial

Can't access the internet after arriving at your destination? Don't worry, it's often just a phone setting issue. Please check your settings following these simple steps based on your phone model.

1
Turn On Mobile Data and Data Roaming
Single SIM or eSIM Device:
1. Go to "Settings" > "Mobile Data" > "Mobile Data Options"
2. Ensure "Data Roaming" is turned ON (displayed as bright green).
Dual SIM or Dual eSIM Device:
1. Go to "Settings" > "Mobile Data"
2. Select the SUN Mobile SIM card > "Mobile Data Options"
3. Ensure "Data Roaming" is turned ON (displayed as bright green).
2
Manually Select Network
1. Go back to "Mobile Network" > "Network Selection" > Confirm "Automatic" is turned OFF.
2. Manually select the local partner carrier.
3
APN Settings (Usually no need for manual setup)
- Go to "Mobile Network" > "Mobile Data Network".
- Under "Mobile Data", enter the APN: SUNMobile

Android Phone Data Roaming Setup Tutorial

Since the operation interfaces of different Android phone brands may vary slightly, the following steps provide the most common setup process.

1
Enable Data Roaming
1. Access Network Settings:
  - Open "Settings" > "Connections" > "Mobile Networks"
2. Turn on related functions:
  - Enable "Mobile Data"
  - Enable "Data Roaming"
2
Dual SIM Users, Check SIM Card Settings
1. On the "Mobile Networks" page, check and ensure the "Default Data SIM" is set to the SUN Mobile SIM card.
3
Manually Select Network (Use when connection fails)
If the connection is unstable or you cannot find a signal, manually select the local partner carrier:
- On the "Mobile Networks" page, turn OFF "Automatically select network".
- After the phone finishes searching, manually select the network with the strongest signal or the one partnered with your service provider from the list.
4
APN Settings (Usually no need for manual setup)
If you still cannot access the internet after completing the above steps, check the Access Point Name (APN):
- On the "Mobile Networks" page, tap "Access Point Names (APN)".
- In both the "Name" and "APN" fields, enter: SUNMobile
- Save and select this APN.

Data Roaming Service Phone Setup FAQ

Data Roaming Activation and Setup
- Q1: How do I confirm that my Android phone has data roaming enabled?
  A1: Enabling data roaming is a key step to use the service. Please check and enable the feature following these steps:
  Go to your phone's "Settings".
  
  Tap "Connections" or "Wireless & networks".
  
  Select "Mobile networks" or "Mobile data".
  
  Turn ON the switch next to "Data roaming".
  Tip: This is a necessary setting to ensure your phone can connect to local networks and transmit data abroad.
- Q2: I have turned on data roaming, but still cannot access the internet. What should I do?
  A2: If you still cannot connect after enabling roaming, please check the following three points:
  Confirm "Mobile Data" is turned ON.
  
  Perform a manual network search and select the roaming carrier shown in the list.
  
  Check or reset the "Access Point Name (APN)". Usually, the system detects it automatically, but if the connection fails, try setting the APN to "SUNMobile".
- Q3: My phone has dual SIM (Dual SIM) capability. What do I need to be aware of?
  A3: If you are a dual SIM phone user, please be sure to confirm the following:
  Go to "Mobile Networks" settings.
  
  Find the "Default data SIM" or similar option.
  
  Make sure this setting is selected as the SUN Mobile SIM card.
  
  If the default data SIM is set incorrectly, the phone will try to connect using the wrong SIM card, causing roaming failure or unexpected charges.
- Q4: I'm worried about forgetting to turn off data roaming. Will it generate high charges?
  A4: It is recommended that when you are not using data, keep "Mobile Data" ON but switch "Data Roaming" to OFF. This can prevent unexpected roaming charges.

Connection and Network Troubleshooting
- Q5: Why does my phone show a signal connection, but the internet speed is very slow or cannot load web pages?
  A5: This might be caused by the following reasons:
  Network Type: You might be connected to an older local network (e.g., 2G/3G). You can try manually switching to "Preferred network type" in "Mobile Networks" settings, for example, selecting 4G/LTE or 5G.
  
  Manual Network Selection: Try manually selecting the carrier. In "Mobile Networks" settings, turn OFF "Automatically select network", wait for the phone to search for nearby networks, then manually select the one with the strongest signal or partnered with your service provider.
- Q6: Do I need to manually turn off data roaming?
  A6: The data roaming function is recommended to be turned on after arriving at your destination and confirming the service is active.
  After returning to Hong Kong: To avoid accidentally connecting to networks outside Hong Kong in border areas and incurring charges, it is recommended to turn OFF the "Data Roaming" function on your phone after returning to Hong Kong.