- S-Band
- S/I (signal-to-interference ratio)
- S/N (signal-to-noise ratio)
- SACCH (Slow Associated Control Channel)
- Sampling
- SAT (Set-up Audio Tone)
- Satellite
- Satellite Carrier
- Satellite Dish
- Satellite Master Antenna Television (SMATV)
- Satellite Phone
- Scambler
- Scattering
- SCCH (Signaling Control Channel)
- SCH (Synchronization Channel)
- SDCCH (Slow Dedicated Control Channel)
- SDH (Synchronous Digital Hierarchy)
- SDMA (Space Division Multiple Access)
- Sector
- Sectorization
- Sensitivity
- Service Area
- Service Plan
- Service Provider
- SFHMA (Slow Frequency Hopped Multiple Access)
- Shadow fading
- Shadowing Effect (Shadow)
- SHF (Super High Frequency)
- Sideband
- Signal Booster
- Signal-to-interference ratio
- Signal-to-Noise Ratio (S/N)
- Signaling
- SIM Card (Subscriber Identity Module Card)
- Simplex
- Simulcast
- Simultaneous Multiple Round Action
- Site
- Slamming
- SLAVE
- Sleep Mode
- Slotted ALOHA
- Slow fading
- Smart Antenna
- Smart Card
- Smart Phone
- SMR (Specialized Mobile Radio)
- SMS (Short Messaging Service)
- SMSC (Short Message Service Center)
- SMT (Surface Mount Technology)
- SN64
- SNR Signal-to-Noise Ratio
- SOCS (Satellite linked Off-shore Cellular System)
- Soft handoff
- Space diversity
- Special Emergency Radio Services (SERS)
- Specialized Common Carrier (SCC)
- Spectrum
- Spectrum Assignment
- Spectrum Cap
- Spectrum Etiquette
- Spectrum spreading
- Speech Coding
- Spread Spectrum
- SR (Spread Rate)
- SRAM (Static Random Access Memory)
- SS Spread Spectrum
- SS7 (Signaling System 7)
- SSD (Shared Secret Data)
- STANDBY
- Standby Time
- Stereo
- Submultiplexed
- Subscriber
- Subscriber Fraud
- Subscriber Number
- Subscriber Profiling
- Supplementary services
- Switch
- Symbian
- Synchronization
- Synchronous
- System A/B
- System ID
- System Selection Switch
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