Roaming

Imagine you're on a road trip and you drive through different towns. Each town has its own radio station, but your car radio automatically switches to the best station available as you move. You don't have to do anything; it just works.

It's similar for your mobile phone. When you travel outside your home network's coverage area, your phone automatically connects to another network that has an agreement with your home network. This allows you to make calls, send texts, and use data just like you would at home, without any extra effort on your part.