| Business | Phone |
| E C Communications 2125 C Ave, National City 91950 | (619) 477-5156 |
| American Hi Tech Comm Ii 1467 E Plaza Blvd, National City 91950 | (619) 477-7878 |
| Convergence Communications 3030 Plaza Bonita Rd, National City 91950 | (619) 470-6330 |
| M C Communications 199 E 27th St, National City 91950 | (619) 434-6432 |