AT&T Fiber is available in Sullivan's Island. Call 833‑607‑2973 • Sponsored AT&T Fiber is available in Sullivan's Island. Get speeds up to 5 Gig. Check availability ↗ or call 833‑607‑2973 • Sponsored
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Sullivan's Island has 10 internet options – View all▼
Sullivan's Island has one fiber provider, AT&T, and one cable provider, Xfinity. Symmetric speeds of 5,000 Mbps are available in parts of Sullivan's Island.
| Provider | DownDownload (Mbps) | UpUpload (Mbps) | AvailabilityCoverage |
|---|---|---|---|
| AT&T | 5,000 | 5,000 | 100% |
| Provider | DownDownload (Mbps) | UpUpload (Mbps) | AvailabilityCoverage |
|---|---|---|---|
| Xfinity | 2,000 | 250 | 100% |
| Provider | DownDownload (Mbps) | UpUpload (Mbps) | AvailabilityCoverage |
|---|---|---|---|
| AT&T | 100 | 20 | 100% |
| Provider | DownDownload (Mbps) | UpUpload (Mbps) | AvailabilityCoverage |
|---|---|---|---|
| Verizon | 300 | 20 | 100% |
| MINTernet | 100 | 20 | 100% |
| T-Mobile | 100 | 20 | 100% |
| AT&T | 100 | 20 | 71% |
| Provider | DownDownload (Mbps) | UpUpload (Mbps) | AvailabilityCoverage |
|---|---|---|---|
| Starlink | 280 | 30 | 100% |
| Provider | DownDownload (Mbps) | UpUpload (Mbps) | AvailabilityCoverage |
|---|---|---|---|
| HughesNet | 100 | 5 | 100% |
| Viasat | 100 | 3 | 100% |
Broadband Map's availability estimates are based on the census boundaries of Sullivan's Island. Speed metrics capture internet providers' maximum advertised speeds. Both may be overoptimistic.
Broadband Map's listings of internet providers in Sullivan's Island rely primarily on the May 2026 release from the FCC's Broadband Data Collection program (representing Sullivan's Island ISPs' availability as of December 2025).