As time has gone by there has been a huge expansion in mobile and cell phone advances and technology. At the same time the range of available options and services from the cell companies has changed. To a large extent this has happened because the companies cant continue to sell the same large volume of new handsets to new customers as they used to, this is because the majority of people now have at least 1 cell phone, so the carrier and tech companies add additional services for subscribers for a cost. For example broadband is now becoming a standard option so you can browse the web remotely. Another cell service is reverse cell lookups which are designed to allow people to look into who owns a particular phone by searching on the number, for example when someone has called them from a cell but they do not recognise the number.