| Abbreviation | Definition |
|---|---|
| SNET | Southern New England Telecommunications |
| SNI | Subscriber-Network Interface |
| SNIX | Single Noise Interference Xterminator |
| SNR | Signal-to-Noise Ratio |
| SO | Serving Office |
| SOA | Service Order Administration |
| SOGA | Share of Gross Adds |
| SOH | Section OverHead |
| SOR | Service Operation Request |
| SPA | Service Planning Area |
| SPA | Special Prorate Agreement |
| SPC | Service Provider Code |
| SPC | Stored Program Control |
| SPCS | Stored Program Control System |
| SPD | Serial Presence Detect |
| SPE | Synchronous Payload Envelope |
| SPF | Summertime Phone Functionality |
| SPH | Samsung PHone |
| SPI | Service Provider Interface |
| SPID | Service Profile IDentifier |