| Abbreviation | Definition |
|---|---|
| IMMAT | Instituto Municipal Malvinas Argentinas Telecomunicaciones |
| IMP | Interface Message Processor |
| IMPACT | Integrated Manufacturing Precision Assembly Cellular Technology |
| IMPCS | Indian Mobile Personal Communication System |
| IMPI | IP (Internet Protocol) Multimedia Private Identity |
| IMR | International Mobile Roaming |
| IMS | Internal Messaging System |
| IMS | IP (Internet Protocol) Multimedia Subsystem |
| IMSI | International Mobile Subscriber Identity |
| IMT | International Mobile Telecommunications |
| IMT-A | International Mobile Telecommunications - Advanced |
| IMTC | Imtcinternational Multimedia Telecommunications Consortium |
| IMTC | International Multimedia Telecommunication Consortium |
| IMT-FT | International Mobile Telecommunications - Frequency Time |
| IMTS | Improved Mobile Telephone Service |
| IN | Intelligent Network |
| INA | Information Network Architecture |
| INE | Intelligent Network Element |
| INPT | Institut National des Postes et Télécommunications |
| INSAT | INdian National SATellite |