MOBILE

Do you have a mobile phone? I’m sure you have at least one. Mobile phone is now a very important thing to human. Without it, human can’t communicate each other, especially when there were far away from each other. Mobile phone nowadays is not only to call someone or messaging someone, but it has plenty of function such as access to the internet, Bluetooth, infrared, camera with video recorder, MMS(receiving and sending photo or video),gaming, email, push to talk, the new one is television and so on. There were plenty of mobile phone brands such as Nokia, Motorola, Samsung, Sony Ericsson and so on. Nokia is currently the world's largest manufacturer of mobile phones, with a global device market share of approximately 40% in 2008. Other major mobile phone manufacturers (in order of market share) include Samsung (14%), Motorola (14%), Sony Ericsson (9%) and LG (7%).These manufacturers account for over 80% of all mobile phones sold and produce phones for sale in most countries. Mobile phones generally obtain power from batteries, which can be recharged from a USB port, from portable batteries, from mains power or a cigarette lighter socket in a car using an adapter (often called battery charger or wall wart) or from a solar panel or a dynamo (that can also use a USB port to plug the phone).Formerly, the most common form of mobile phone batteries were nickel metal-hydride, as they have a low size and weight. Lithium-Ion batteries are sometimes used, as they are lighter and do not have the voltage depression that nickel metal-hydride batteries do. Many mobile phone manufacturers have now switched to using lithium-Polymer batteries as opposed to the older Lithium-Ion, the main advantages of this being even lower weight and the possibility to make the battery a shape other than strict cuboids. Mobile phone manufacturers have been experimenting with alternative power sources, including solar cells.