Roaming refers to the ability of a mobile phone to access services outside its home network. When a user travels to a different area or country, their phone can connect to local networks, allowing them to make calls, send texts, and use data. This is especially useful for travelers who want to stay connected while away from home. However, roaming can lead to additional charges, as users may incur higher fees for using services on foreign networks. To avoid unexpected costs, many mobile service providers offer roaming plans or packages that allow users to pay a flat rate for services while abroad, making it easier to manage expenses.