What are the differences between GSM and CDMA technology in mobile telephony?

GSM and CDMA are two different technologies used in mobile telephony. GSM stands for Global System for Mobile Communications and is a digital cellular technology used for transmitting mobile voice and data services. CDMA stands for Code Division Multiple Access and is a type of multiplexing technique used in digital cellular networks. 

GSM vs CDMA: Overview

GSM and CDMA are two different technologies used in mobile telephony. GSM is a digital cellular technology used for transmitting mobile voice and data services, while CDMA is a type of multiplexing technique used in digital cellular networks. GSM is the most widely used technology in the world, while CDMA is used mainly in the United States. GSM networks are based on a SIM card, while CDMA networks are based on a phone's ESN (electronic serial number). GSM networks use a GPRS (General Packet Radio Service) data connection, while CDMA networks use a 1xRTT (1x Radio Transmission Technology) data connection. GSM networks are more secure than CDMA networks, as they use encryption to protect user data.

GSM vs CDMA: Network Coverage

GSM networks have a much wider coverage than CDMA networks. GSM networks are available in more than 200 countries, while CDMA networks are available in only a few countries, mainly in the United States. GSM networks are also more reliable than CDMA networks, as they are less prone to interference and signal dropouts. GSM networks also offer better call quality than CDMA networks, as they use a more advanced digital signal processing technology.

GSM vs CDMA: Data Speeds

GSM networks offer faster data speeds than CDMA networks. GSM networks use a GPRS (General Packet Radio Service) data connection, which is capable of speeds up to 114 Kbps. CDMA networks use a 1xRTT (1x Radio Transmission Technology) data connection, which is capable of speeds up to 153 Kbps. GSM networks also offer better data coverage than CDMA networks, as they are available in more countries.

GSM vs CDMA: Cost

GSM networks are generally more expensive than CDMA networks. GSM networks require a SIM card, which can be expensive, while CDMA networks require a phone's ESN (electronic serial number), which is usually free. GSM networks also require a monthly subscription fee, while CDMA networks do not. GSM networks also require a higher upfront cost for the phone, as GSM phones are usually more expensive than CDMA phones.