| Abbreviation | Definition |
|---|---|
| SPIN | Service Provider Identification Number |
| SPMT | Self-Propelled Modular Transporter |
| SPN | Service Panel Number |
| SPNI | Service Provider Network Identifier |
| SPSR | Service Provider Switching & Routing |
| SPTC | Swaziland Post and Telecommunications Corporation |
| SPTC | Swaziland Posts and Telecommunications Corporation |
| SPU | Service Publication Unit |
| SPV | Sound, Picture, Voice |
| SQ | Service Quality |
| SQE | Signal Quality Error |
| SQM | Signal Quality Manager |
| SQR | Signal to Quantizing noise Ratio |
| SR | Service Request |
| SR | Subscriber Ready |
| SRA | Seamless Rate Adaptation |
| SRB | Signalling Radio Bearer |
| SRD | Short Range Device |
| SRL | Singing Return Loss |
| SRM | Short-Range Modem |