Many of the companies that make cell phones for other companies also make cell phones for AT&T. These manufactures include LG, Samsung, and Microsoft.
Companies that buy back old cell phones are ones that can then use the old phones to be used for scrap to make new and better phones for users. The companies that actually do this and buy the old phones include SellCell and USell.
There are many great cell phones on the market. I-phones are very popular, but also can be very expensive. Android phones are also great phones and are available through multiple cell phone companies.
The best time of the year to get a discount for cell phones is the holiday season. All companies are currently offering discounts on last years model cell phones.
Many companies give their employees cell phones to use while they are doing business. Alltel Wireless cell phones are used in many government offices as well in many industrial businesses.
Cell phones and smart phones are very different. Cell phones are limited to talking and texting. Smart phones on the other hand are like mini computers and are capable of many functions.
The best place to get unlocked Nokia cell phones is Amazon. Amazon has a wide variety, easy shipping, and has the added benefit of allowing different companies to compete, giving you the cheapest price.
These used cell phones are returned to the manufacturers. Those companies then either refurbish them and resell them, or extract the parts out of them that can be recycled.
There are many companies who manufacture cell phones. Some are: Motorola LG Nokia Samsung Kyocera Audiovox BlackBerry HTC UT Starcom
Although pre-paid phones aren't as common amongst Americans, there isn't that much difference between the quality of the phones. The one thing that is different is that usually companies that offer contracts will offer extra perks and apps.
The best website to compare prices on cellphone is http://shopper.cnet.com/buy-cell-phones-accessories/. You can also find reviews at http://electronics.pricegrabber.com/cell-phones/p/327/. From what I believe, they have websites such as bizrate and nextag which offer a variety of options on cell phones and they have different brands and companies.
Some of the companies that offer GPS for a cell phone are Blackberry and iPhone. GPS for a cell phone is a convenient feature that can be used to locate a lost cell phone.