What is a characteristic of CDMA technology?

CDMA technology, or Code-Division Multiple Access, is characterized primarily by its ability to transmit across multiple frequencies. This method uniquely allows several signals to occupy the same physical channel by assigning a unique code to each call, which separates calls without needing different frequencies for each conversation. This capability enhances the efficient use of the available spectrum, allowing more simultaneous calls within a given bandwidth, making CDMA a popular choice in many mobile network systems.

In contrast, the other choices do not correctly describe CDMA characteristics. For example, while GSM is indeed a major standard in Europe, CDMA does not serve as its primary technology. Additionally, while some may perceive CDMA systems as being more expensive to implement than GSM systems, this is not a definitive characteristic of the technology itself. Finally, CDMA does not solely operate on the 1.9 GHz band; it utilizes a range of frequencies across various bands, thus making it versatile and effective in different operational environments.