| Business | Phone |
| Ambient Data Solutions Inc 1042 N Mountain Ave, Upland 91786 | (909) 985-9160 |
| Call Savers 400 N Mountain Ave, Upland 91786 | (909) 949-4500 |
| Isdg Inc 222 N Mountain Ave, Upland 91786 | (909) 946-3777 |
| Joy Communications 824 Linden Ct, Upland 91786 | (909) 982-3133 |
| Mitel Inc Upland 91786 | (909) 949-1145 |
| West Coast Communications Inc 1921 W 11th St, Upland 91786 | (909) 949-1350 |