These really do work. You may not notice a huge difference if you already have a good signal but you will notice a difference when you have a poor signal. They improve the phone's performance in elevators, car, boat, mountain, tunnels, buildings and many more places. The Internal Booster Antenna is a passive device designed to capture stray radiation in the body of the phone and re-radiate the signal. It can be used on any brand cell phone, cordless phone, walkie talkies or pager. I had one customers tell me it helped their wireless internet card. Instructions are on the back of the package.
These work better on some phones than others. There are so many models it is hard to say how well it will work on your phone but at this price I think it is well worth it to try them. You can see by reading a lot of my feedback they work great for some people and not for others. In my house we could notice a difference on 2 out of 3 phones. These are not refundable.
These are the real thing. There are fakes for sale that don't contain metal. These are the new generation X boosters enhanced for today's cellular phones; they are an improvement over generations 1, 2, 3 and 4.
These are made to last 18 months. I recommend replacing them every year.