How Can One Phone Call Be So Many Different Things at Once?

Imagine your phone is like a magical mailbox. When you speak into it, instead of sending letters, it sends sound waves that are turned into numbers, kind of like secret codes. These numbers travel through wires or the air until they reach someone else’s phone, which turns them back into sound so you can hear what they said. This works whether you’re talking to a friend next door or across the world.