Enhanced Data rates for GSM Evolution (EDGE) permits further developed information transmission rates as a backward-compatible augmentation of GSM. It was started in 2003 by Cingular in the United States. It utilizes a backward-compatible extension of GSM of digital mobile technology. It utilizes 8PSK modulation in order to accomplish a higher information transmission rate. The modulation arrangement was changed to 8PSK from GMSK. This gives a benefit as it can pass on 3 bits per symbol, and enhance the maximum data rate.