Transmission towers are built by a couple of different people or groups. Typically, a site acquisitionist will scope areas that need added coverage or have the availability or means to support a cell site. Site Acquisitionists might work for a wireless provider like AT&T or Verizon, or may be part of a tower company like Crown Castle or American Tower. When a site is found, an agreement worked out with the land owner, and it is zoned and permitted, the group will either hire a contractor team or use an in-house team to install the tower.
Towers are prefabricated, in sections, by tower manufacturing companies like ROHN and Sabre Industries. They're then transported to the site for assembly.
American Tower
America Movil (AMX)
There are a number of sites on the internet that offer cell phone ratings. Some sites that you may want to visit include Cnet, Phone Arena and Phone Scoop.
There are many cell phone review sites available. One of the best is consumersearch (http://www.consumersearch.com/cell-phones). There, you can search by features or carrier to find the right phone for you.
At&t
You can often get free cell phone themes from your phone providers websites. However, you can also get them from the sites such as Z Edge, Mobile 88, Mobile Heart and Cell Mind.
American Tower Corp
You can find lots of sites offering free cell phone ringtones. A couple of good sites are www.myxer.com and www.zedge.net.
we can use a cell phone for a transmission in network.. dinesh kumar dhaneru
Booty me down
The "cell" in cell phone is a shortened form of the word cellular. This refers to the type of transmission towers used to convey signals. Cell phones are simply radios that transmit on minute frequencies. The range of frequencies used are managed by the individual cellular providers (cell phone companies). These companies build and arrange transmission antennae (cell towers) in a way that transmission coverage from each tower overlaps those around it. This provides relatively (theoretically) seamless coverage. As long as the cell phone remains within line of sight of a transmission tower, and within the phone's transmission range, calls can be completed. In the days of analog cell phones (and this may still hold true today), the average transmission range for a cell tower was 15 miles over land, and 50 miles over water.
There are several sites that offer free cell phone number lookup. These include Ask.com and Spydialer.com.
You can purchase cell phones online at the cell phone carriers website, eBay, Wal-Mart, Amazon, and a wide variety of other cell phone stores and auction sites.