| Business | Phone |
| Daisy 20 Pgp Inland Comm 1739 E G St, Ontario 91764 | (909) 988-0509 |
| Linkline Communication 360 S Milliken Ave # G, Ontario 91761 | (951) 727-5000 |
| Cal Tek Communications 3113 Whitestag Rd, Ontario 91761 | (909) 229-4585 |
| Hallmark Communications 4055 E Guasti Rd, Ontario 91761 | (909) 783-2252 |
| Intellisys Communications 285 S Dupont Ave # 102, Ontario 91761 | (909) 937-2372 |
| Mpower Communications Corp 3400 Inland Empire Blvd, Ontario 91764 | (909) 455-1000 |
| Peh Communications 2009 S Campus Ave # C, Ontario 91761 | (909) 923-3327 |
| Precision Communications 1815 E Princeton St, Ontario 91764 | (909) 460-0688 |