- Gain
- Gateway
- Gaussian channel
- General Order 159 (A) (G.O. 159)
- Geostationary satellite
- Geosynchronous satellite
- GGSN (Gateway GPRS Support Node)
- Gigahertz (GHz)
- GLONASS (Global Navigation System)
- GMPCS (Global Mobile Personal Communications Services)
- GMSC (Gateway Mobile Services Switching Center)
- GMSK (Gaussian Minimum Shift Keying)
- Golay sequential code
- GPRS (General Packet Radio Service)
- GPS (Global Positioning System)
- Grade of Service (GOS)
- Graphical User Interface (GUI)
- Gray market
- Ground AMSL (Above Mean Sea Level)
- Ground segment
- Group call
- GSM (Global System for Mobile Communications )
- GSM 1800
- GSM 1900
- GSM 900
- GSM-Plus
- GSM-R
- Guard band
- GWCS (General Wireless Communications Service)
G
