Supporting HSDPA/UMTS 2100MHz and GSM/GPRS/EDGE 900/1800/1900MHz; Supporting HSDPA packet data service with a maximum transmission rate of 1.8Mbps; Supporting UMTS packet domain data service with a maximum transmission rate of 384kbps; Supporting EDGE packet data service with a maximum transmission rate of 236.8kbps; High-quality voice service based on UMTS or GSM; Supporting circuit switched (CS) data service based on UMTS or GSM; Stable and reliable voice & data concurrent service over UMTS; Supporting SMS service based on GSM, EGPRS or UMTS, supporting group transmission of SMS; The client E620 Manager program supports a high-capacity phone book, SMS box and call record function;