CDMA: Code-Division Multiple Access refers to any of several protocols used in so-called second-generation (2G) and third-generation (3G) wireless communications. As the term implies, CDMA is a form of multiplexing, which allows numerous signals to occupy a single transmission channel, optimizing the use of available bandwidth.
In cellular service there are two main competing network technologies: Global System for Mobile Communications (GSM) and Code Division Multiple Access (CDMA). Cellular carriers including Sprint PCS, Cingular Wireless, Verizon and T-Mobile use one or the other. Understanding the difference between GSM and CDMA will allow you to choose a carrier that uses the preferable network technology for your needs.
The GSM Association is an international organization founded in 1987, dedicated to providing, developing, and overseeing the worldwide wireless standard of GSM. CDMA, a proprietary standard designed by Qualcomm in the United States, has been the dominant network standard for North America and parts of Asia. However, GSM networks continue to make inroads in the United States, as CDMA networks make progress in other parts of the world. There are camps on both sides that firmly believe either GSM or CDMA architecture is superior to the other. That said, to the non-invested consumer who simply wants bottom line information to make a choice, the following considerations may be helpful.
Coverage: The most important factor is getting service in the areas you will be using your phone. Upon viewing competitors' coverage maps you may discover that only GSM or CDMA carriers offer cellular service in your area. If so, there is no decision to be made, but most people will find that they do have a choice.
Data Transfer Speed: With the advent of cellular phones doing double and triple duty as streaming video devices, podcast receivers and email devices, speed is important to those who use the phone for more than making calls. CDMA has been traditionally faster than GSM, though both technologies continue to rapidly leapfrog along this path. Both boast "3G" standards, or 3rd generation technologies.
I was on sprint and now with att. I thought that I would miss the speed of the sprint network but I am pleased to report that att evan with a 2g bb is great.
I remember in high school, everyone had nextel phones which had sim cards. Service %^%^*&(*( sucked, but everyone had one, so the walkie talkie feature kept bills down for parents. I also remember that some of the kids would go to parties and other social events like the football games and school dances and when someone had a better phone than they did, they would just take the phone and swap sim cards. . .viola. . .new phone. What exactly is the purpose or benefit to a sim card? They just seem like a huge hassle to me.
I don't know whats so good about sim cards but here in australia everyone uses sim cards and only those people that lives in areas without coverage uses CDMA phones.....
