Mobile revolution

NOKIA PHONES IN HANDS......

The Nokia N80 is a multimedia 3G smartphone made by Nokia with support for high-speed UMTS/WCDMA connections. Features include a 3-megapixel camera with built-in flash (on the back of the device), another camera (on the front) for videoconferencing, Wi-Fi (802.11g), Universal Plug and Play (UPnP), FM radio, Bluetooth 1.2, digital music player functionality, MiniSD memory card slot, and support for 3D Java games. Because of its memory card and relatively large screen, it can function as a portable media player.

It uses the third edition of the Series 60 user interface (S60v3) and the Symbian operating system version 9.1. It is not backward compatible with software compiled for earlier versions of the Symbian operating system.

The N80 is Nokia's first UPnP-compatible phone, allowing you to transfer media files to compatible devices over Wi-Fi.

Since the introduction of mobile phones, concerns have been raised about the potential health impacts from regular use.^[25] As mobile phone penetrations grew past fixed landline penetration levels in 1998 in Finland and from 1999 in Sweden, Denmark and Norway, the Scandinavian health authorities have run continuous long term studies of effects of mobile phone radiation effects to humans, and in particular children. Numerous studies have reported and most studies consistently report no significant relationship between mobile phone use and health. Studies from the Institute of Cancer Research, National Cancer Institute and researchers at the Danish Institute of Cancer Epidemiology in Copenhagen for example showed no link between mobile phone use and cancer.^[26][27] The Danish study only covered analog mobile phone usage up through 1995, and subjects who started mobile phone usage after 1995 were counted as non-users in the study.^[28] The health concerns have grown as mobile phone penetration rates throughout Europe reached 80%–90% levels earlier in this decade and prolonged exposure studies have been carried out in almost all European countries again most reporting no effect, and the most alarming studies only reporting a possible effect. However, a study by the International Agency for Research on Cancer of 4,500 users found a statistically significant link between tumor frequency and mobile phone use.^[29]

The many links to cellphones and sperm quality of cause is a strong scientifically evidence that the radiation emitting from Mobile phones always should be considered as potentially dangerous, even if we don't know all the mechanism behind the already known dangers to living cells and organisms.[3

Mobile phones and the network they operate under vary significantly from provider to provider, and country to country. However, all of them communicate through electromagnetic radio waves with a cell site base station, the antennas of which are usually mounted on a tower, pole or building.

The phones have a low-power transceiver that transmits voice and data to the nearest cell sites, usually not more than 8 to 13 km (approximately 5 to 8 miles) away. When the mobile phone or data device is turned on, it registers with the mobile telephone exchange, or switch, with its unique identifiers, and will then be alerted by the mobile switch when there is an incoming telephone call. The handset constantly listens for the strongest signal being received from the surrounding base stations. As the user moves around the network, the mobile device will "handoff" to various cell sites during calls, or while waiting (idle) between calls it will reselect cell sites.

Cell sites have relatively low-power (often only one or two watts) radio transmitters which broadcast their presence and relay communications between the mobile handsets and the switch. The switch in turn connects the call to another subscriber of the same wireless service provider or to the public telephone network, which includes the networks of other wireless carriers. Many of these sites are camouflaged to blend with existing environments, particularly in scenic areas.

The dialogue between the handset and the cell site is a stream of digital data that includes digitized audio (except for the first generation analog networks). The technology that achieves this depends on the system which the mobile phone operator has adopted. The technologies are grouped by generation. The first-generation systems started in 1979 with Japan, are all analog and include AMPS and NMT. Second-generation systems, started in 1991 in Finland, are all digital and include GSM, CDMA and TDMA. Third-generation networks, which are still being deployed, started with Japan in 2001, are all digital, and offer high-speed data access in addition to voice services and include WCDMA (known also as UMTS), and CDMA2000 EV-DO. China will launch a third 3G technlogy on the TD-SCDMA standard. Each network operator has a unique radio frequency band.^{[citation needed]}