The cell phone business has increased hugely in recent years, and now the phone companies face a new problem they did not imagine would happen so quickly - most people who they see as their prospective customers now have phone handsets and contracts, so how are these businesses going to build more profits in the future? One way to keep making more money is to make the phone style and feature sets change rapidly as time goes by so that most of their customers will want to upgrade their phones regularly. This means that instead of finding new customers they make money from their existing ones. There are other companies who make money from the cell phone market, for example websites which offer reverse cell phone lookup services. These sites are not free, they let people search for cell info for free but then to access to the details they charge a fee.