| Business | Phone |
| A-1 Telephone Po Box 905, La Mesa 91944 | (619) 698-3904 |
| Anthony's Communication Svc 4350 Palm Ave, La Mesa 91941 | (619) 466-8001 |
| Cabrillo Communications La Mesa 91941 | (619) 460-8585 |
| Telcom Data Inc 8265 Commercial St # 17, La Mesa 91942 | (619) 461-5420 |
| Telephone Jack Installations Po Box 1141, La Mesa 91944 | (619) 283-0687 |