Wireless Communications Abbreviation Definitions
just in case you would like to know what they mean here you go
SIM: Subscriber identity module
GSM: Global System for Mobile Communications
CDMA: Code division multiple access
WCDMA: Wideband Code Division Multiple Access
UMTS: Universal Mobile Telecommunications System
LTE: Long-Term Evolution
HSPA : High Speed Packet Access
EDGE: Enhanced Data rates for GSM Evolution