Short answer
Samsung Ireland says data roaming is when the phone uses a mobile network that is not owned by your network provider, which most commonly happens when you use the phone abroad, and that the provider may charge extra. Samsung's Ireland page names the switch Data Roaming, and Samsung's US page names it Data Roaming Access.
If the eSIM is installed and still has no data, the line, roaming, and APN checks are covered in Japan eSIM installed but no internet?.
Fact table
As of 2026-10-21
Each claim names its source. The full source list, with the date each page was read, is below.
| Claim | Source |
|---|---|
| Samsung Ireland says data roaming is when the phone uses a mobile network that is not owned by your network provider, and that this most commonly happens when you use the phone abroad. The provider may charge extra. The path is Settings, Connections, Mobile Networks, then the Data Roaming switch. Samsung says you can then use mobile internet abroad. | Samsung Ireland, data roaming |
| Samsung's US page says that if you leave your carrier's coverage, you may still reach mobile data by turning on Data roaming, and to contact the carrier before you do because there may be additional charges. The path is Settings, Connections, Mobile networks, then the Data Roaming Access switch. Samsung says screens and settings may vary by wireless service provider, software version, and phone model. | Samsung US, Galaxy data usage |
| The Japan eSIM guide is the write-up for installing a Japan eSIM. It says settings labels vary by device and software version, to choose the travel eSIM as the mobile data line, and to enable roaming for that line when you are ready to use it. It also says home-carrier roaming charges may apply. | Wakamo Japan eSIM guide |
FAQ
What does data roaming mean?
Samsung Ireland says data roaming is when the phone uses a mobile network that is not owned by your network provider, and that this most commonly happens when you use the phone abroad. The provider may charge extra.
Where is the data roaming switch on a Galaxy?
Samsung's Ireland page says Settings, Connections, Mobile Networks, then the Data Roaming switch. Samsung's US page says Settings, Connections, Mobile networks, then the Data Roaming Access switch. Samsung says screens and settings may vary by wireless service provider, software version, and phone model. The Japan eSIM guide says settings labels vary by device and software version.
Can data roaming cost extra?
Samsung Ireland says the provider may charge extra. Samsung's US page says to contact the carrier before turning Data roaming on because there may be additional charges. The Japan eSIM guide says home-carrier roaming charges may apply.
Where do I install the eSIM on a Galaxy?
The Japan eSIM guide is the write-up for installing a Japan eSIM. This page does not repeat the add-eSIM menus.
Sources
Samsung Ireland, data roamingsamsung.com
Data roaming uses a mobile network the provider does not own. Samsung says this most commonly happens abroad, and that the provider may charge extra. Settings, Connections, Mobile Networks, then the Data Roaming switch. Samsung says mobile internet then works abroad.
Accessed 2026-10-21.
Samsung US, Galaxy data usagesamsung.com
Outside the carrier's coverage, Data roaming may still reach mobile data. Contact the carrier first because additional charges are possible. Settings, Connections, Mobile networks, Data Roaming Access. Screens vary by provider, software, and model.
Accessed 2026-10-21.
Wakamo Japan eSIM guidewakamo.io
Wakamo product information. The Japan eSIM guide is the write-up for installation. Settings labels vary by device and software version. Choose the travel eSIM as the mobile data line and enable roaming for that line when you are ready to use it. Home-carrier roaming charges may apply.
Accessed 2026-10-21.