O2 is a foremost British telecommunication company specialised in mobile phones.O2 holds mobile phone business in the UK, Republic of Ireland and Germany. In the UK, O2 operates 900MHZ and 1800MHZ frequency bands offering GSM and GPRS carrier services.O2 retains 20-25% market share in the UK. The O2 mobile network lately commenced a 3G or UMTS carrier network which operates in a different area of electromagnetic spectrum around 2100MHZ.O2s turnover for the March 2005 was 6.683 billion. O2 is well known for its strategic partnership with companies such as Research in Motion, manufacturers of the Blackberry email product, and HTC, manufacturers of O2xda, Xda2 and Xda Exec Pocket PC device.

With over half of the UK population owning a mobile phone, you can find large proportions of O2 owners. O2 mobile network has augmented its network coverage over last decades in 800 areas to reach more that 99% population of the UK.O2 mobile network have the ability to carry over 40 millions calls a day. The success of O2 mobile phone network is a result of dedication and attributes of keeping the customers requirement in mind. The extensive range of O2 mobile phone deals and offers are designed to get the best value of customers money.

Manufacturers like Samsung and Nokia dedicate themselves at creating different handsets with different features whereas network providers such as O2 and Vodafone concentrated mainly on building up the network itself. Whenever you make a call from your handset it positions your call to the nearby antenna for your network that is available and virtually connects you to the wired telephone system. The network then establishes the connection to the antenna which is close by for the person you want to call and connects you to his mobile phone. This illustration will help you to understand the concept of mobile phone network.