tdma and fdma
Hand off
Code Division Multiple Access or CDMA cell phones utilize a technology that permits the use of several frequencies at the same moment to send and receive data and voice transmissions. CDMA is newer radio technology that is designed to compete with the older Global System for Mobile Communications (GSM) network. As a result, CDMA phones cannot use GSM cell towers. Another difference is that GSM phones use SIM cards while CDMA phones do not.
yes you can change gsm to cdma via mnp.
gsm
Metropcs phones run on CDMA technology and right now, there is no unlocking solution for CDMA-based phones, only for GSM phones.
CDMA, offers better data transfer
US Cellular is a CDMA network meaning that it uses Code Division Multiple Access as its primary technology. This type of network is different from other networks in its use of a code to differentiate between different conversations instead of using a different frequency for each conversation. US Cellular is not a GSM network which stands for Global System for Mobiles and instead uses CDMA technology. CDMA (Code Division Multiple Access): US Cellular uses this technology as its primary technology. It uses a code to differentiate between different conversations instead of a different frequency for each conversation. GSM (Global System for Mobiles): US Cellular is not a GSM network and instead uses CDMA technology.
GSM = Global System for Mobile communications. CDMA = Code Division Multiple Access.
cdma gsm
Gsm
In short, no. WCDMA is designed to enhance GSM networks, even though it's technology is similar to CDMA, it uses different language.
CDMA technology uses spread spectrum concept thereby giving users unique code to de-spread the information being sent to them. so CDMA is secure and occupies a large bandwidth of information compared to GSM technology.