I purchased a screen protector for my phone and received one of these as a "free gift with purchase." I remember seeing these on TV years ago before I even had a cell phone.  I figured I would try it out since I got it as a free bonus, so why not?  I followed the directions (peel off and place under battery; replace battery; turn on phone...etc.) and what happened?  Nothing.  My phone signal did not improve at all.  I left it on for a week and went to various locations.  My signal did not change anywhere I went.  Nothing was "boosted" in any way.  I peeled the sticker off and parts of this "magic gold signal trapper" came off with it.  I don't think this is any different than a sticker or a Band-aid.  I bet a Band-aid would probably provide more of a signal than this item.  Don't waste your money.  If you get it for free, great, but don't "install" it on your phone. It's pointless.  If your phone signal is that bad constantly, switch providers.  Don't buy these Snake Oil Stickers.