| Business | Phone |
| Hills Communications 9 William Jenkins Rd, St Helena Island 29920 | (843) 838-7016 |
| Milspec Communications Inc 858 Sea Island Pkwy, St Helena Island 29920 | (843) 838-7247 |
| Pinnacle Towers Inc 177 Ephraim Rd, St Helena Island 29920 | (843) 838-3206 |
| Pinnacle Towers Inc 765 Lands End Rd St, St Helena Island 29920 | (843) 838-1103 |
| South Carolina Coastal Comm 22 Polowanna Rd, St Helena Island 29920 | (843) 838-4766 |