Instruct: Classify a given review as either positive or negative.
Query: Totally Worthless!

If it costs a penny, and worked, likely all cell phones would have one. The antenna is within the cellphone case and is of the proper length for the wavelength of the frequency used. This gold painted plastic sticker sticks on the inside behind the battery. There is no way possible for it to do anything at all. "If it sounds too good to be true, it ususally is." I received one of these for free and compared my "stickered" cell phone with an identical "unstickered" cell phone in rural MT with 0-1 bar reception. Both phones worked the same with or without the sticker. Save your pennies, and dollars of shipping. Use a Wilson cell phone antenna plugged directly into your hidden antenna port, or better a Wilson booster kit, for a real difference. Amazon is the best in selection and pricing and I have one for the office, home, and 2 cars, and they get me 5 bars where there were 0-1. Simple hook-up.