| Abbreviation | Definition |
|---|---|
| GMSS | Global Mobile Satellite System |
| GOMP | Get Off My Phone |
| GOS | Gerry Otis Simpson |
| GOSIP | Government Open System Interconnection Profile |
| GOSIP | Government Open Systems Interconnection Profile |
| GPBX | Global Private Branch eXchange |
| GPRS | General Packet Radio Service |
| GPS | Global Positioning System |
| GPTA | Guangdong Post and Telecommunication Administration |
| GRT | Georgian Railway Telecom |
| GRT | Global Routing Table |
| GRUB | Greedy Reclamation of Unused Bandwidth |
| GS | Ground Start |
| GSA | Guarded Single Assignment |
| GSM | Global System for Mobile (communications) |
| GSM | Groupe Speciale Mobile |
| GSMA | Global System Mobile Association |
| GSM-R | Global System for Mobile (communications) Rail |
| GSM-R | Global System for Mobile (communications) – Rail |
| GSN | GPRS (General Packet Radio Service) Support Node |