Every nation is experiencing economic crisis; factories and businesses close down and many employees are laid off, but one industry that seems not to be affected is the communications industry, more particularly, Telephony. Telephony is the electronic transmission of voice, fax, and other information using a handheld device containing both a speaker or transmitter, and a receiver. The Cellular technology is one of the fastest and still growing industries which may never suffer. Millions of cellular phone users are subscribing to various mobile networks around the world that is why many communication networks grow big because of the boom in cellular industries. Before, Telephony systems were analog but because of their inability to cope with the growing needs of telecommunication industry with cost efficiency, digital technology was realized. With digital technology, better receptions of signals are experienced with low level of interference, integration, transmission, switching and improved levels to meet the needs of current telecommunication industry. With telecommunication innovation, Telephony users can download applications to use on their cell phones for all kinds of purposes. However, all of these have limitations. In spite of the innovations, systems and services are limited within the country wherein the system is deployed and no services are available from other countries making communication for longer distances very expensive and sometimes impossible. Definitely, roaming services are the methods used to communicate if you’re going abroad.