AT&T Business vs Granite: Which ISP Is Better?

Choosing an internet service provider for your business often means weighing options from industry giants and specialized aggregators. AT&T Business is a household name offering a wide array of connectivity services, while Granite is known for consolidating multi-location network needs onto a single platform.

To help you decide which is a better fit for your organization, we're comparing them head-to-head. Our analysis is built on proprietary data from over 70,000 real-world ISP quotes, giving us unique insight into pricing, installation timelines, and service delivery.

Keep reading for our detailed comparison of AT&T Business and Granite. If you're ready to explore your provider options now, you can begin our questionnaire to receive real-time quotes.

Overview of AT&T Business

With a history dating back to 1885, AT&T is a foundational name in telecommunications. The Dallas, Texas-based company employs around 150,000 people, operates in 46 countries, and holds the 32nd spot on the Fortune 500 list.

Beyond its scale, AT&T Business is known for its focus on network reliability. This is supported by its AT&T Guarantee program, which credits customers for downtime, and consistent J.D. Power awards for customer satisfaction in the large enterprise space.

Overview of Granite

Granite was founded in 2002 and is headquartered in Quincy, Massachusetts. While not a Fortune 500 company, it serves more than 85 Fortune 100 clients, managing 1.75 million voice and data lines across 700,000 locations.

With around 2,200 employees, Granite operates primarily in the United States and Canada. The company uses its proprietary AccessExpress tool to confirm serviceability for specific locations rather than providing a general public coverage map.

A key part of Granite's model is its focus on customer support, offering a U.S.-based service center that operates 24/7/365. The company also runs an in-house innovation arm, Granite Labs, to develop new communication solutions.

ISP Products

Dedicated Internet (DIA)

AT&T provides its own AT&T Dedicated Internet service over its extensive 1.1 million-mile fiber network. This allows them to offer a wide spectrum of speeds, from 10 Mbps up to 1 Tbps, backed by a 99.95% uptime SLA and add-ons like DDoS mitigation.

Our proprietary data shows AT&T's DIA installation times average 89 days, which is longer than the 77-day industry average. Their pricing is also on the higher side, at 8% above average for 100 Mbps circuits and 27% above for 1 Gbps circuits.

Granite operates as an aggregator, using its AccessExpress platform to source DIA from multiple carriers, so available speeds vary by location. For its on-net services, Granite offers a 99.99% uptime SLA. According to our data, Granite's installations are faster than average at 72 days, and their pricing is 21% above average for 1 Gbps—slightly more competitive than AT&T for higher-speed connections.

It's important to remember that these are aggregate figures; installation times and pricing can vary significantly based on your region and specific DIA configuration.

For an exact comparison of AT&T Business, Granite, and other top ISPs for your area, we invite you to fill out our questionnaire. It's powered by the most comprehensive data set in the industry, giving you a true picture of your options.

DIA Pricing, Delivery and Install Days Compared

The data in this table comes from Lightyear’s aggregated ISP quotes collected in 2024 and 2025 YTD.

• Install Days: how long it typically takes to deliver service.
• 100Mb Price vs Avg / 1Gb Price vs Avg: shows whether this ISP is cheaper or more expensive than the market average.
• Delivery Point: “Suite” means the ISP delivers service all the way to the company’s server room; “MPOE” means the circuit stops at the building’s minimum point of entry (typically the building's utility basement) and the tenant must handle the inside wiring.

Wireless

AT&T Business provides wireless services directly through its own 5G and LTE networks across the U.S. and parts of Canada and Mexico. Their offerings, such as Internet Air, deliver 5G or LTE service to a fixed location for primary or backup connectivity, and are backed by a high-level wireless service agreement.

Granite, on the other hand, operates as a wireless aggregator, managing services from multiple carriers. This allows them to offer solutions like managed fixed wireless access and multi-carrier SIMs for cellular failover across the U.S. and Canada. Because Granite sources from different providers, service level agreements are dependent on the underlying carrier for each specific location.

Security

AT&T Business offers a suite of specific security products to complement its connectivity services. For example, AT&T Active Armor is included with their Business Fiber for 24/7 proactive security. For more robust protection, they offer AT&T Dynamic Defense to block cyber threats and Secure Service Active Edge to secure remote network access.

Granite, in contrast, integrates security directly into its managed network services. Their approach centers on a Secure Access Service Edge (SASE) platform, which combines SD-WAN with security functions like Zero Trust components. This allows for unified security policy management across all of a company's locations through a single managed service.

Broadband

AT&T provides its own AT&T Business Fiber, a direct service offering symmetrical speeds from 300 Mbps up to 5 Gbps. Our proprietary data shows their broadband installations are significantly faster than the market average of 28 days, taking only 18 days on average.

Their pricing is also quite competitive, sitting about 18% below the market average for broadband services.

Granite, on the other hand, operates as a managed aggregator with its Broadband (Granite Access) product. They source connectivity from multiple carriers, which means available speeds (up to 5 Gbps) and transport types like fiber, coax, or fixed wireless vary by location.

This aggregator model leads to longer installation times of 41 days on average. Granite's broadband pricing is also higher, at 29% above the market average according to our data.

Broadband Pricing, Delivery and Install Days Compared

The data in this table comes from Lightyear’s aggregated ISP quotes collected in 2024 and 2025 YTD.

• Install Days: how long it typically takes to deliver service.
• 500mb Price vs Avg: shows whether this ISP is more expensive than the market average.
• Delivery Point: “Suite” means the ISP delivers service all the way to the company’s server room; “MPOE” means the circuit stops at the building’s minimum point of entry (typically the building's utility basement) and the tenant must handle the inside wiring.

Ethernet

AT&T Business provides Ethernet services directly over its own extensive fiber network. This approach means that when you buy an Ethernet service from AT&T, you're getting a product managed end-to-end by a single provider.

In contrast, Granite operates as a managed aggregator for its Ethernet offerings. They partner with various underlying carriers to deliver Dedicated or Carrier Ethernet services, which means availability and technical specifications can differ based on the location.

The primary difference for a buyer is choosing between a direct carrier relationship with AT&T or Granite's consolidated management of multiple carriers. Your decision may depend on whether your business has locations within AT&T's footprint or requires a single point of contact to manage services across different network providers.

POTS Replacement

Both AT&T and Granite offer solutions to replace traditional analog phone lines (POTS), which is essential for specialty equipment like fire alarms, elevators, and fax machines. AT&T’s product is called Phone for Business – Advanced, while Granite provides its EPIK solution for life-safety and specialty lines.

Both services are designed to operate over your existing internet connection, and you are not required to use internet from either provider. They are also both compliant with the National Fire Protection Association (NFPA) 72 standard, making them suitable for critical life-safety applications.

A few differences are worth noting. AT&T's plan includes unlimited domestic calling and a standard 24-hour battery backup. Granite's solution, an analog overlay, includes LTE failover and power backup that varies by configuration, focusing on reliability for specialty lines rather than voice calling features. Both are available nationwide in the U.S.

Other Key Features Compared

Geographic Coverage

AT&T Business has a significant global presence, with operations in 46 countries. This makes them a strong option for companies that need connectivity for offices around the world.

Granite's focus is more regional, primarily serving the United States and Canada.

Instead of a public map, they use their AccessExpress tool to confirm if service is available at your specific address.

SLA

Both companies offer strong uptime guarantees, known as Service Level Agreements (SLAs). AT&T's dedicated internet comes with a 99.95% uptime promise, while Granite's on-net DIA services are backed by a slightly higher 99.99% uptime SLA.

In practical terms, AT&T's guarantee allows for about 4.4 hours of potential downtime per year. Granite's stricter SLA means they aim for less than one hour of downtime annually for their on-net circuits.

If a provider fails to meet its uptime promise, it typically issues a credit to your account for the period of the outage, as outlined in your service agreement.

Transport Types Available

AT&T Business operates its own network with 1.1 million fiber route miles. This lets them directly offer a wide range of speeds for different business needs.

Granite is an aggregator, so they resell services from various carriers. The transport types they can provide, such as fiber or coax, depend on what’s available at your location.

AT&T's direct fiber is great for high-demand use. Granite's model is helpful for businesses that need to manage different connection types across multiple locations.

Customer Support

AT&T Business has a strong reputation for customer satisfaction, particularly with large enterprise clients, backed by multiple J.D. Power awards.

Granite, on the other hand, emphasizes accessibility with its U.S.-based support center, which is available 24/7/365. This means you can always reach someone, no matter the time or day.

Your decision may come down to whether you prefer a provider recognized for its service to large companies or one that offers constant, direct support access.

Final Verdict: AT&T Business or Granite?

Your choice between AT&T Business and Granite comes down to a fundamental difference. AT&T is a direct carrier that owns its network, while Granite is a managed aggregator that bundles services from multiple providers.

AT&T is often a strong fit for businesses with locations within its large fiber footprint, especially those prioritizing competitive broadband pricing and fast installations. Companies with a global presence may also find its international network beneficial.

Granite excels for organizations with many locations spread across different regions. Their model provides a single point of contact for billing and support, which simplifies managing a complex network portfolio.

The right provider depends on your company's specific geographic needs and whether you prefer a direct carrier relationship or a consolidated management approach.

AT&T Business vs. Granite: At a Glance

To help you see the differences in one place, here’s a quick summary of how AT&T Business and Granite stack up based on our data and analysis.

Choose the Right ISP Today With Lightyear

Choosing between a direct carrier like AT&T and a managed aggregator like Granite requires a clear understanding of your business needs. If your locations are concentrated within AT&T's fiber network and you value competitive broadband rates, they might be the better choice. If you manage a wide portfolio of sites across the U.S. and Canada and prefer a single point of contact, Granite's model offers a simpler approach.

Making that evaluation can be complex, but our platform is built to give you clarity. Lightyear provides the data and tools to compare providers like AT&T and Granite side-by-side, based on your exact locations. We help you not just choose an ISP, but manage the entire lifecycle. Here’s how:

• Automated ISP Procurement: We digitize the RFP process using the largest proprietary pricing dataset in enterprise telecom, so you can see best-fit providers and benchmarked rates.
• Transparent Pricing & Negotiation: Our platform proactively negotiates quotes down if they don’t align with market data, making sure you get a fair price.
• Lifecycle Tracking After You Choose: Lightyear’s software stores all your circuit information, contracts, and technical details, keeping your network inventory automatically updated.

If you're ready to simplify your telecom procurement and find the right provider with confidence, we're here to help. Schedule a demo with our team to see how our platform works and get started.