roaming
v.v. to use your mobile phone to make calls or use data while you are traveling in a different country or area. Your phone connects to a network that is not your usual one.
v. to use a mobile device on a network other than the home network to which it is registered. This occurs when a subscriber travels outside the coverage area of their primary service provider.
Check the costs before you start roaming in another country.
Most modern mobile plans include international roaming, allowing users to access the internet while traveling abroad without changing SIM cards.
The European Union has implemented regulations to eliminate additional roaming charges, ensuring that citizens pay the same rates for mobile services regardless of which member state they are visiting.
The verb is intransitive in this technical sense; often used as a gerund ('roaming') to describe the service or the state of the device.