Bought this Cell phone signal booster a couple of month back, and so far it is working great. It is compatible with older cell phones that work with 800 or 1900 mhz range. It did improve the signal inside my home that had dead spots for my cell phone. Make sure you get the right booster for your specific cell phone. Wilson Electronics also carries booster for the newer smart phones that run on 3G or 4G. Check your phone's manual or cell phone vendor for the frequency that your phone uses so you can get the right booster for your cell phone.