Until we got the zboost set up we could not get service at all in the house. This is not good because I have clients trying to reach me on my cell phone. I needed to at least be able to check messages on my cell. I could get one and maybe two bars outside on my balcony of my two story house. By setting up the zboost in my office with the antenae at the hightest peak of a catherdral ceiling. I am now able to get one and sometimes two bars inside sitting at my desk with the amplifier next to me.If you can put your antenae outside it works much better. We just didn't want to do this and it works good enough for us as it is. This instructions and support were not very good. That is why I only give it 4 stars. After we figured everything out on our own we understood what they were saying.