| Business | Phone |
| A T & T Global Network Svc 500 Kendall St, Cambridge 2142 | (617) 494-0336 |
| X O Communications Inc 10 Ware St, Cambridge 2138 | (617) 497-6690 |
| Abc Telephone Svc 1 Memorial Dr, Cambridge 2142 | (617) 225-0278 |
| Global Phone Inc 110 Kendall Sq # 600 Pmb, Cambridge 2139 | (617) 225-5180 |
| Pilgrim Telephone Inc 1 Kendall Sq, Cambridge 2139 | (617) 225-7000 |
| Pilgrim Telephone Inc 180 Bent St, Cambridge 2141 | (617) 225-7788 |