[Nananmi doesn't have a ton of patience, but he does sympathize with people just tossed in here with no understanding of things.]

It's a cellular telephone, something like an evolution of a standard telephone. Like the great, great, great grandchild of the original model. Instead of connecting to others via wires it sends out signals that other phones like it can receive. It also allows you to send words, images and even moving images the same way.

[Envy knows what a phone is, so he's trying not to dumb it down too far, but it's tough to know what sort of technology level he's coming from.]

I take it you're brand new here.