International roaming allows you to use your mobile phone to make calls, send texts, and access the internet while traveling outside your home country. This service lets you stay connected without needing to buy a local SIM card. However, it often comes with additional charges, which can be quite high depending on your mobile carrier and the country you are visiting. When you roam internationally, your phone connects to a local network in the foreign country, which is why you can still use your services. It's important to check with your mobile carrier about their roaming plans and fees before you travel to avoid unexpected costs.