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A Fiber connection can provide fast, reliable home internet, but even a wired connection can experience an outage. A damaged line, equipment problem, severe weather or a wider network issue can temporarily take your home offline.
For eligible AT&T customers, AT&T Internet Backup provides a way to stay connected during that interruption. Instead of requiring a separate backup internet service, it uses an eligible AT&T wireless device to provide a cellular connection to your AT&T home gateway.
The important part is that your phone isn’t simply becoming a hotspot that you have to connect every laptop, TV or smart-home device to individually. When Internet Backup is properly activated, the eligible mobile device works with your AT&T All-Fi Hub to keep the home network connected while the Fiber service is unavailable. When Fiber is restored, the backup connection automatically turns off and the gateway returns to the Fiber connection.
AT&T currently includes Internet Backup at no additional cost for eligible customers who combine AT&T Fiber with qualifying AT&T Wireless service.
How AT&T Internet Backup Works
The easiest way to understand Internet Backup is to think of it as a temporary bridge between your Fiber connection and AT&T’s cellular network.
Fiber working → Fiber outage → Wireless backup activates → Home stays connected → Fiber returns → Backup turns off
Here’s what happens in practice.
1. Your Fiber connection is working normally
Under normal conditions, your AT&T All-Fi Hub connects your home to the Fiber network. Your phones, computers, TVs, cameras and other connected devices use your normal home Wi-Fi.
Internet Backup remains available in the background but isn’t being used.
2. Your Fiber connection goes down
If AT&T detects that your Fiber connection has been interrupted, Internet Backup can provide an alternative connection through an eligible AT&T wireless device.
AT&T’s current support documentation says the backup connects the All-Fi Hub to an eligible mobile device associated with the Fiber account. Smart Home Manager sends a notification when Internet Backup is activated.
3. Your home network switches to cellular connectivity
This is the part that makes Internet Backup different from simply turning on your phone’s hotspot.
The All-Fi Hub continues providing your home’s Wi-Fi network, while the eligible smartphone or tablet supplies the cellular connection. That means devices already connected to your home network can remain connected without you manually moving each one to a phone hotspot.
4. Fiber service is restored
Once the Fiber connection comes back, Internet Backup automatically deactivates and your All-Fi Hub returns to the normal Fiber connection.
So the feature is designed as a temporary fallback—not as a permanent replacement for your Fiber service.
What Do You Need for AT&T Internet Backup?
Internet Backup isn’t available simply because you have an AT&T phone and an AT&T internet connection. AT&T currently lists specific requirements.
You need AT&T Fiber and an eligible AT&T residential gateway. AT&T’s current support documentation identifies the BGW320 or BGW620 All-Fi Hub as compatible gateways. You also need a smartphone or tablet on an eligible AT&T Wireless unlimited data plan, with the device associated with the AT&T Fiber account.
You also need the AT&T Smart Home Manager app or the AT&T app installed on a device associated with the wireless account.
The account details matter as well. AT&T’s current Guarantee terms say the names and addresses on the Fiber and wireless accounts need to match for eligibility, and the smartphone associated with the authorized wireless line must be at home during the Fiber outage. Location tracking must also be enabled on the devices.
Because AT&T can change eligibility requirements, customers should check the current requirements before assuming their particular phone, plan or gateway qualifies.
Is Internet Backup Already Enabled?
Not necessarily. AT&T says the account holder and authorized wireless user must activate the Internet Backup feature through the Smart Home Manager app.
Current AT&T setup instructions direct customers to open Smart Home Manager while connected to their home Wi-Fi, find the Internet Backup card, select the option to begin setup and follow the prompts. The app may request permissions needed for the backup feature to operate, including cellular data, notifications and location services.
It’s worth setting this up before an outage happens. Trying to configure a backup connection after your Fiber service has already failed is not the ideal time to discover that a required device, permission or account setting isn’t ready.
Does Internet Backup Work During a Power Outage?
No.
This is one of the most important limitations to understand. Internet Backup provides a backup internet connection, not backup electricity. AT&T specifically states that Internet Backup will not work during power outages.
The reason is straightforward: your AT&T All-Fi Hub still needs electricity to operate. Your phone may have cellular service and battery power, but that doesn’t automatically keep your home router or other networking equipment running.
For example, imagine a storm causes two separate problems:
- Fiber line goes down, but your home still has electricity: Internet Backup may provide cellular connectivity through your eligible wireless device.
- Electricity goes out: Your All-Fi Hub cannot continue operating normally unless you have an appropriate backup power source. Internet Backup itself does not supply that power.
So if uninterrupted connectivity is particularly important to you, Internet Backup and a separate battery backup or UPS solve two different problems.
What Can You Expect From Backup Performance?
Internet Backup is designed to keep you connected, but you shouldn’t expect it to perform exactly like your Fiber connection.
Your normal Fiber connection may provide hundreds of Mbps or even multi-gigabit speeds. The backup connection relies on AT&T’s cellular network, so performance depends on wireless conditions, network capacity and the location of the participating mobile device.
AT&T states that backup speeds vary and that it may temporarily slow wireless data speeds when the network is busy. That makes Internet Backup better understood as connectivity resilience, rather than a second Fiber connection.
For example, a remote worker may still be able to send messages, join a video meeting or access cloud files while Fiber is unavailable. A smart-home household may also benefit because connected devices can remain on the home’s Wi-Fi network instead of requiring manual hotspot connections.
However, activities that depend heavily on bandwidth may perform differently during the backup period. Large downloads, high-resolution streaming or other demanding tasks may not behave the same way they do over your normal Fiber connection.
The goal is simple: stay connected until Fiber comes back, not reproduce your normal Fiber performance.
Does AT&T Internet Backup Cost Extra?
For eligible customers, AT&T currently includes Internet Backup at no additional cost when they have qualifying AT&T Fiber and AT&T Wireless service. AT&T announced the expanded availability of free Internet Backup as part of its AT&T Guarantee in March 2026.
AT&T’s current Guarantee page continues to advertise Internet Backup as included for customers with AT&T Fiber and an eligible wireless plan.
However, “free” doesn’t mean every AT&T customer automatically receives it. You still need qualifying Fiber service, compatible equipment, eligible wireless service and activation.
AT&T also notes that backup service may not be available in every location and that the feature is subject to its current terms and restrictions.
Who Benefits Most From Internet Backup?
Internet Backup can be particularly useful for households where losing internet access creates an immediate problem.
A person who works from home, for example, may not want a short Fiber outage to interrupt a video meeting or prevent access to work systems.
It can also be useful for homes with connected security cameras, smart locks, alarms and other internet-dependent devices. Keeping the home network operating can reduce the disruption caused by a temporary Fiber outage.
Families that rely heavily on internet-based communication, cloud services and streaming may also appreciate having a fallback connection available.
The feature is less about getting faster internet and more about having another path online when your normal connection is unavailable.
AT&T Internet Backup FAQs
- What is AT&T Internet Backup?
AT&T Internet Backup is a feature that uses an eligible AT&T wireless device to provide cellular connectivity to an AT&T Fiber home network when the Fiber connection goes down. The All-Fi Hub continues serving connected devices over the home’s Wi-Fi network.
- Does my phone become a Wi-Fi hotspot?
Not exactly. The eligible mobile device provides the cellular connection to the AT&T All-Fi Hub, allowing the home network to remain active. Your connected devices can continue using the home’s Wi-Fi instead of individually connecting to your phone’s hotspot.
- Does AT&T Internet Backup cost extra?
AT&T currently includes Internet Backup at no additional cost for eligible customers who have qualifying AT&T Fiber and AT&T Wireless service.
- Will Internet Backup work if the power goes out?
No. AT&T specifically says Internet Backup does not work during power outages. The All-Fi Hub still needs a power source to operate.
- Does Internet Backup provide the same speed as Fiber?
No. Backup performance depends on the cellular connection and network conditions. AT&T says speeds vary and wireless data may be slowed when the network is busy.
- What equipment is required?
AT&T’s current support documentation lists AT&T Fiber, a BGW320 or BGW620 All-Fi Hub, an eligible smartphone or tablet on an AT&T Wireless unlimited data plan and the appropriate AT&T app for setup and management.
- Does backup turn off when Fiber comes back?
Yes. AT&T says Internet Backup automatically turns off when Fiber service is restored, and the All-Fi Hub returns to its normal Fiber connection.
The Bottom Line
AT&T Internet Backup gives eligible Fiber customers a temporary cellular fallback when their Fiber connection goes down. Rather than requiring every device in the house to switch to a smartphone hotspot, the eligible wireless device works with the AT&T All-Fi Hub to keep the home’s Wi-Fi network connected.
It currently comes at no additional cost for eligible AT&T Fiber and wireless customers, but it requires compatible equipment, qualifying wireless service and prior activation.
Just remember what the feature does, and what it doesn’t do. It can provide a temporary alternative to a failed Fiber connection, but it isn’t a battery backup, doesn’t guarantee Fiber-level speeds and won’t keep the home network running during a power outage without an independent power source.
For households where an internet interruption can mean missed work, disconnected security devices or lost access to important online services, that temporary backup connection can provide another layer of resilience.