| Business | Phone |
| X O Communications Inc 505 Sansome St, San Francisco 94111 | (415) 477-4600 |
| X O Communications Inc 1 Front St, San Francisco 94111 | (415) 901-3800 |
| United Telcom 1305 Grandview Dr, San Francisco 94080 | (650) 615-9000 |
| United Telcom 880 Dubuque Ave, San Francisco 94080 | (650) 615-8925 |
| I P Deliver 300 California St, San Francisco 94104 | (415) 923-6400 |
| I P Deliver 900 N Point St, San Francisco 94109 | (510) 923-6400 |
| I P Global Voice Inc 1 Pier, San Francisco 94111 | (415) 399-9693 |
| I P Networks Inc 365 Main St, San Francisco 94105 | (415) 227-1160 |
| Inc 21 Communications San Francisco 94102 | (415) 554-3520 |
| Lilly Erin Architecture 2442 California St, San Francisco 94115 | (415) 885-6000 |
| Mbr Phone San Francisco 94103 | (415) 431-2562 |
| Mci 375 Newhall St, San Francisco 94124 | (415) 970-2100 |
| Real Telephone San Francisco 94109 | (415) 440-5700 |
| S F Telephone 41 Wood St, San Francisco 94118 | (415) 575-5500 |
| Sbc 666 Folsom St # 1126, San Francisco 94107 | (415) 542-3981 |
| Sympel Communications 300 Brannan St, San Francisco 94107 | (415) 243-8870 |
| T-Systems Inc 425 Market St # 22, San Francisco 94105 | (415) 955-0512 |
| Tcg Sales 1 Bush St, San Francisco 94104 | (415) 276-0000 |
| Tel Save Inc 303 2nd St, San Francisco 94107 | (415) 974-6670 |
| Telecon Ltd Inc 55 Hawthorne St, San Francisco 94105 | (415) 834-1543 |
| Telespree 525 Brannan St, San Francisco 94107 | (415) 817-0800 |
| A T & T Cits 575 Burnett Ave, San Francisco 94131 | (415) 647-5327 |