Communications: Voice, Radio and Data - Question about "Cell Antenna"?

I bought a MP3 player and in the invoice was a little package with this little sticker looking divice. It says, "as seen on TV" and that it is suppose to improve cell phone recption.
We live in a mobile home, in a mobile home park, down in a valley, with a few big steel buildings next to the park, so our rerception is pretty poor, and non existing indoors. I have never heard of this, and my main concern is making sure it isn't some kind of device to hack, clone or what ever my cell phone. It is just a small sticker, about the size of a postage stamp, with something that looks like a circuit board on it. Can anyone tell me if this is safe?

Yes they are safe. I would be surprised if they do much.

I agree with classicsat....you can't boost what you aren't getting in the first place.

It was free, So I thought we'd try it. With all the scams and stuff out there I just wanted to be sure it was safe. ty