Firstly there’s the SIM card technology which greatly enables a mobile phone user to make and receive calls while moving around the country in the following ways. Security features include Authentication and encryption to protect data and prevent eavesdropping. A mobile phone contains a subscriber identity module (SIM) a smart card that gives the user access to a range of subscriber services. The SIM card identifies the subscriber to the network system. lobal Sim-cards allow you to roam across a number of different countries, on different networks, with a single Sim-card. Global Sim-cards usually offer cheaper international calls and texts than a UK Sim-card. However, this depends on what country you are in. The current market scenario does not allow the SIM cards available in the market place to be ported with applications over the air. New SIM card seeding would be required for this activity which some Telco’s have already started working on. SIM card is extremely secure as a mode and is ideal for Banking Applications to be ported on.
Secondly there’s the network technology which greatly enables a mobile phone user to make and receive calls while moving around the country in the following ways. A mobile phone (also known as a cellular phone, cell phone, and a hand phone) is a device that can make and receive telephone calls over a radio link while moving around a wide geographic area. The country is divided into overlapping cells each using a different set of radio frequencies. At the centre of each cell is a base station connected to an antenna (mobile phone mast) which communicates with all of the mobile phones in the cell. A group of base stations is connected to a mobile telephone switching centre which will be connected to a second level MTSO and so on. These switching offices are connected to the public telephone system. General packet radio service (GPRS)/3G