After reading other reviews, my husband and I put 2 on each of our phones. He got a 2 bar boost and I got a 1 bar boost. Which is awesome when it's 1 bar from 0. I don't know if it works any better than putting aluminum on your phone or something, but it does help. For $2 it was worth it because we live in a bad signal area and we've already switched phone companies (and phones) twice. I may put a third on mine and see if it gives any more help. We tried it out of desperation more than anything, but we're very glad it helped. ANY help is worth 5 stars at this point!