Top Managed IT Companies in Denver

National ComTel (One Call Networks)

Providing VoIP, Toll Free & Internet Services For Businesses Like Yours

✓ Verified Provider ⭐ 4.7/5 Stars Est. 1993
Denver, CO
1–9 employees
Founded 1993
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National ComTel (One Call Networks) is a managed IT services provider based in Denver, CO, operating since 1993. Across 7 verified Google reviews it averages 4.7 out of 5, a public track record you can weigh during diligence. It focuses on Managed IT Services, Cybersecurity, Network Management, VoIP & Business Phone. Compare it against other Denver managed IT providers, then request a quote.

Vetted by the Best IT MSP editorial team · Last updated June 2026

About National ComTel (One Call Networks)

National ComTel (operating with partner brand One Call Networks) is a Denver-based provider combining VoIP/telecom, managed IT services, and office cabling/network integration for businesses nationwide.

Services Offered

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Managed IT Services
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Cybersecurity
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Network Management
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VoIP & Business Phone

Why Choose National ComTel (One Call Networks)

4.7/5 From 7 Google Reviews

With 7 reviews averaging 4.7, National ComTel (One Call Networks) has a checkable public track record rather than marketing claims alone.

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Based in Denver

National ComTel (One Call Networks) is headquartered in Denver, CO, so Denver businesses get a local team for on-site work instead of a distant call center.

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Combination of three companies (The PC Whisperer,

Combination of three companies (The PC Whisperer, National ComTel, Integration Inc.) under One Call Networks

Nationwide business based in Denver

Nationwide business based in Denver

Location

Denver, CO

Certifications & Compliance

Combination of three companies (The PC Whisperer, National ComTel, Integration Inc.) under One Call Networks
Nationwide business based in Denver

Frequently Asked Questions

What do National ComTel (One Call Networks) reviews say?

Across 7 verified Google reviews, National ComTel (One Call Networks) averages 4.7 out of 5. Weigh that public track record alongside a direct quote.

Which IT services does National ComTel (One Call Networks) provide?

National ComTel (One Call Networks) delivers Managed IT Services, Cybersecurity, Network Management, VoIP & Business Phone to organizations across Denver, CO.

What area does National ComTel (One Call Networks) serve?

National ComTel (One Call Networks) is based in Denver, CO and supports businesses across Denver and the greater metro area.

When did National ComTel (One Call Networks) start?

National ComTel (One Call Networks) has been operating since 1993.

Is National ComTel (One Call Networks) certified?

National ComTel (One Call Networks) carries Combination of three companies (The PC Whisperer, National ComTel, Integration Inc.) under One Call Networks, Nationwide business based in Denver.