Mobile-satellite service means using a special kind of technology to talk or message on a phone or other device, even when you are far away from any phone towers or buildings. It's like having your own personal satellite that helps you communicate with people all over the world.
You know when you hold your phone up to your ear to talk to someone? That's how phones usually work. But sometimes, people go to places where they can't hold their phone up to their ear and still talk to someone, like if they're in the middle of the ocean or in an airplane. That's where mobile-satellite service comes in.
Instead of using the phone towers that you see around your town, mobile-satellite service sends your message or call up to a satellite that circles around the Earth. From there, the satellite sends your message or call to another satellite that is closer to the person you want to talk to. That satellite then sends your message or call down to the person's phone.
This might seem like magic, but it's all done using special technology and equipment that the phone companies use. This way, people can talk or message no matter where they are in the world, even if there are no phone towers nearby.
But remember, even though mobile-satellite service is a cool and helpful technology, it's important to use it responsibly and only when you really need it.