Mobile phones or cell phones are so called because they cover compartmentalized, cell areas. The origin of the cell phone can be traced back to the year 1973 when Motorola came with World `s first mobile phone that was sold as Motorola DynaTAC 8000X. Today, new mobile phones are introduced at a rapid pace. Part of them are assembled in the rule as follows: PCB, antenna, keypad, LCD display – LCD, battery, microphone, speaker. Lately, they have a wide range of functions. In the list of some functions, depending on your phone you choose: the coordinates of the transactions; track appointments, reminders, lists of tasks, send / receive email play games, text messages (SMS), Internet access, see and enjoy She TV, built-in calculator, integration with other devices such as GPS receivers, MP3 players, etc. Mobile phones are based on radio frequencies, an innovative approach to the cellular, the limited availability of RF spectrum designed to combat. However, many cell towers are used to a large geographical area needs. Each tower (base station), covers a circular area as a cell. An important section is in a range of cells allows for different base stations use the same channels / frequencies for communication divides. This allows thousands and thousands of mobile phone users to share far fewer channels. Another important aspect is that the phones require less power for transmission to a base station for each base station covers a smaller area to achieve. Reducing the required power transfer battery size and thereby reduces the weight of the phone. This led to the miniaturization of mobile phones that could not have been conducted without the cell phone technology. When you use your cell phone, the following things. First, locate the phone base station with the strongest signal, and the requests for a channel assignment. The base station provides a channel assignment and the call is accepted. The call is then forwarded to the local telephone network, if it is a normal phone when it is transmitted over the air. The call is then sent to its destination via the telephone. When the phone is switched on, SID (System Identification Code) on the control channel, compares them with the SID programmed into the phone. If the SIDs match, the phone contains the cell in communication with the system of the house. The phone sends a request for registration including the CIS and the MTSO keeps track of your phone `s position in a database. If the SID does not correspond to the control channel, the SID of the phone and the phone is roaming. The three technologies that are currently used by 2G cell phone networks for the transmission of information: Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA) / code division multiple access (CDMA). GSM (Global System for Mobile Communications) implements TDMA to connect the providers of specific services in different countries in touch. GSM uses the subscriber identity module (SIM). SIM card stores all data connection / identification numbers needed to access to a provider of wireless services. Standard 2 5G protocols are far GPRS, EDGE distributed, to name a few. Some of the latest 3G protocols are: Universal Mobile Telecommunications System (UMTS) Wideband Code Division Multiple Access (WCDMA), High-Speed Downlink Packet Access (HSDPA), Evolution Data maximized (EVDO). A few popular models of mobile phones on the market by Nokia, Ericsson, Motorola, Samsung, LG, etc. are offered, with each model has its own range of collections. The year 2008 May system highest in the history of the mobile phone with the Nokia N-Gage 2, HTC Dream, iPhone 2, BlackBerry touch screen, Sony PlayStation Phone to be launched.

While minimizing any American roadway it is not uncommon to see electric lines, telephone poles, and cellular towers. However, you may find that it does not seem to be enough cell phone towers in comparison with the number of mobile customers are. This phenomenon is due to the fact that you are not looking for causes in the right places. The cell towers are gone, to hide, disguise themselves as trees, towers and preserve even signs gas station in an attempt to change the appearance of the landscape. The cell towers are to be transmitted, a necessary element in order to allow us our signals and cell phones must be placed at regular intervals on the road. Unlike other utility towers and poles, these structures are wireless, and usually solitary. The number of towers in a region is needed is directly proportional to the density of mobile phone users. Because different companies use different cellular antennas located on the same cell tower, these structures can be very unsightly. Thus, the cell phone tower began to be obscured. Cell phone “trees” have the most popular hide these tech giants to take. These “factories” come in all shapes and forms depending on what types of trees in the vicinity are, in order to disguise the mixture is typically part of a theme of the landscape or in the woods. In the Pacific Northwest, Douglas fir, the most popular types are “planted” in the dense woods and forests in this mountainous region. In southern California, to affect various types of “palm” or their natural counterparts in the streets and boulevards. In the desert of Arizona, “Cactus” result in the most remote areas. Although the birds do not nest in the live “trees, other animals in these towers, as several bugs and insects that do not seem capable of the” factories “from which to distinguish the natural ones. There are several advantages that these cell phone “trees” which have no natural trees. Type phones do not lose their leaves and keep its color indefinitely. You never need pruning or trimming, and retain their original shape in and out of season. Cell phone “trees” are also immune to diseases, pests of trees and drought. These “trees” does not require irrigation or soil, for this question. They can survive equally well in concrete and can be “planted” everywhere. If you are a victim of hay fever, there is no pollen available. Opponents argue that these cell phone “trees” dangerous for the environment. These particular points to the fact that already mentioned that the birds do not nest in these “factories”, says that the birds may be somewhat, we do not claim, and that these “trees” to know a potential danger to himself, Health. Although there are long debates about cancer power lines and poles, a possible link between the disease and cell towers will be connected hotly debated. Opponents also point out that even when you see these mobile “trees” better than conventional tours will be presented in May to the public exposed to potential threats to health, without knowing it, that the towers. Of course, if these people in order to find these towers danger to health, they probably call the locations of their patrons on their cell phones. The cell towers are a necessity in modern life, and to conceal these mechanical monsters, beautiful trees Help us preserve the natural appearance of the area, most people agree that there is political benefit.

• Extends cellular coverage for single or multiple users in homes or offices–provides up to 2500 square feet of coverage
• Works with AT&T, Verizon and Alltel cellular wireless phones in the frequency range of 824-894 MHz
• Omni-directional signal antenna receives signals from multiple cell towers
• Antenna can be installed outdoors above the roofline or indoors in the attic or near a window
• Extends phone battery life–uses less power when signal is stronger

• Extends cellular coverage for single or multiple users in homes or offices–provides up to 2500 square feet of coverage
• Dual-band device works with 800/1900 MHz frequencies from all major carriers–AT&T, Sprint, T-Mobile, Verizon, Alltel, Cricket, and more (not compatible with Nextel)
• Omni-directional signal antenna receives signals from multiple cell towers
• Antenna can be installed outdoors above the roofline or indoors in the attic or near a window
• Extends phone battery life–uses less power when signal is stronger