Cellular communication technologies have evolved greatly in the last few years.   In the United States and around the world there are all kinds of cellular phone services being provided.  In the present, there are many analog service users and there is an ever increasing number of digital service users around the world. Given the fact that there are so many users of analog phones at the time, it is going to be very difficult for this technology to completely dissappear in the near future. Eventually, with the evolution of technology there will be a total shift to digital and other technologies. Costs on digital phones are much lower than analog and you have a wider range of options to choose from when selecting a service plan. The main digital technology used in the United States now is TDMA.  Not as popular in the United States is GSM, which is used grealty in other parts of the world.  In the near future there will be a shift towards the use of CDMA digital technology  due to its various advantages.    CDMA offers greater quality service than other digital technologies as well as being able to hold more users within its network.   Furthermore, CDMA provides the highest level of security within digital technologies.   Eventually, users will choose a technology with extensive capabilities such as satellite communication networks.
 
      As technologies evolve and become more specialized, the use of satellite system networks and total global communication will be more accessible and therefore widely used around the globe.   At the time, Iridium and other satellite-based technologies are not accessible to most people due to their high costs.  An Iridium phone alone costs approximately $3000 US dollars.  For this reason, there are not many users of this technology at the time.   Globalstar and other similar companies are working to lower these costs and attract more users.

      In the short run, it appears that CDMA will replace all other digital technologies as well as analog.  However, in the long run satellite  communication networks will dominate the wireless industry.  Global communication will be the norm and people will be connected at all times and at all places.