EDGE is sometimes also referred to as Enhanced Data Rates for GSM Evolution (EGPRS). It is a 2.5G mobile technology that was developed to increase the data rates of GSM networks. EDGE is based on the GSM standard and uses the same frequency bands as GSM. However, it uses a different modulation scheme and error correction coding to achieve higher data rates. EDGE can provide data rates of up to 473 kbps in ideal conditions. It is often used for mobile internet access, email, and file transfer.
HSCSD is a 2G mobile technology that was developed to increase the data rates of GSM networks. HSCSD stands for High Speed Circuit Switched Data. It is a circuit-switched technology, which means that a dedicated circuit is established between the mobile device and the base station for the duration of the call. This provides a reliable connection, but it also means that the data rate is limited. HSCSD can provide data rates of up to 57.6 kbps.
3GPP is an organization that develops standards for mobile telecommunications. 3GPP stands for Third Generation Partnership Project. It was founded in 1998 by the European Telecommunications Standards Institute (ETSI), the Japanese Association of Radio Industries and Businesses (ARIB), the Telecommunications Technology Committee (TTC) of China, and the Korea Information and Communications Technology Association (TTA). 3GPP has developed standards for a number of 3G and 4G mobile technologies, including UMTS, LTE, and NR.
EGSCSD is not a real technology. It is a made-up acronym that is similar to EDGE and HSCSD.