CDMA means “Code Division Multiple Access,” and is a term used to describe a type of cellphone service technology. When mobile phones first took over the market in the ‘90s, CDMA and GSM network technologies were the most widely used in the U.S.
These two network types compete with one another. For this reason, you may have been told in the past that you can’t use a certain type of cellphone with your network provider. That’s because CDMA carriers and GSM carriers use different technologies that are not compatible with one another.