What does SMGSM mean?

According to the data transmission rate provided by T, GSM module can be divided into GPRS module, EDGE module and pure SMS module. The SMS module only supports voice and SMS services. GPRS is the continuation of GSM. It is usually called "2.5G", which means that this technology lies between the second generation (2G) and the third generation (3G) mobile communication technologies. The transmission rate of GPRS ranges from 56K to 1 14Kbps, and the theoretical rate is as high as171k. Compared with the access speed of GSM 9.6 kbps, GPRS has a faster access data communication speed, and GPRS technology also has the characteristics of anytime and anywhere connection, always online and charging according to traffic. EDGE technology further improves the data transmission rate to 384K-473K, which is called "2.75G", and the data transmission rate is twice that of GPRS. At present, domestic GSM networks generally have GPRS communication function, and both China Mobile and China Unicom networks support GPRS. EDGE has achieved network coverage in some provinces and cities.