| Abbreviation | Definition |
|---|---|
| MSO | Multiple Service Operator |
| MSP | Multi-Signalling Point |
| MSRN | Mobile Station Roaming Number |
| MSS | Modular Sample System |
| MSU | Modem Sharing Unit |
| MSV | Mobile Satellite Ventures |
| MT | Message Transmission |
| MT | Metered Tariff |
| MT | Mobile Telephone |
| MT | Mobile Terminal |
| MTA | Marin Telecommunications Agency |
| MTA | Minnesota Telecom Alliance |
| MTAP | Montana Telecommunications Access Program |
| MTAS | Mobile Terminating Access Service |
| MTAS | Multifunctional Telecommunications Addressing System |
| MTAS | Multimedia Telephony Application Server |
| MTAU | Metalic Test Access Unit |
| MTC | Master Telecommunications Center |
| MTC | Mobile Terminating Call |
| MTL | Malawi Telecommunications Limited |