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AT&T vs Xfinity Mobile: Plans Compared

Xfinity Mobile and AT&T both offer some great cell phone plans, so if you’re stuck choosing between them, our guide can help. We break down every plan by perk, coverage, price, and more, so you know exactly what each plan offers and whether it’s right for you. 

You can also check out other top carriers with our Plan Finder to find the right plan for you.

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AT&T vs Xfinity Mobile: Similarities

  • With both AT&T and Xfinity Mobile, you can rely on plans that give you both 4G LTE coverage and 5G coverage. 
  • AT&T and Xfinity Mobile include hotspot data with their unlimited data plans - though with caveats, more below.
  • Neither AT&T nor Xfinity include taxes and fees in their plans, so be ready to add 10-12 percent to plan prices. 
  • Both carriers have good international roaming options. Every AT&T Unlimited plan comes with unlimited talk, text, and data in and between the U.S., Mexico, and Canada. Xfinity Mobile offers unlimited text and talk on all unlimited plans.
  • Both Xfinity and AT&T offer home internet plans and other services you can bundle with cell phone plans.
  • Neither Xfinity Mobile nor AT&T bundles perks with their plans, like streaming service subscriptions.

AT&T vs Xfinity: Differences

  • While both carriers are ISPs (internet service providers), AT&T is primarily a wireless carrier, while Xfinity, owned by Comcast, only recently started offering cell phone plans under Xfinity Mobile. 
  • Xfinity is a Mobile Virtual Network Operator (MVNO). Instead of owning cell tower infrastructure, as AT&T does, Xfinity rents infrastructure from Verizon’s network.
  • AT&T customers get first dibs on fast speeds. Xfinity Mobile customers might get slowed-down data when the network is busy, since Verizon, the network owner, prioritizes its customers’ data speeds.  On AT&T’s mid-level and premium plans, your premium data can’t be slowed down, even when networks are busy. 
  • AT&T plans are available to everyone, but only Xfinity Internet customers can get an Xfinity Mobile phone plan.
  • AT&T offers multi-line pricing, which means that every subsequent line you add lowers your monthly cost per line. Xfinity adds new lines at a flat rate.

What Is an Unlimited Plan?

As the name implies, you get unlimited data usage with these plans. However, some kinds of unlimited data come at faster speeds than others.

Beyond that, as we mentioned, Xfinity’s plans always put you at risk of slowed-down data since it’s an MVNO, not a primary carrier, even on their Unlimited Premium plans.

Entry-level unlimited plans give you unlimited data, but it’s typically deprioritized data. Some entry-level plans give you some high-speed data, but not all do. 

Mid-level unlimited plans provide that same deprioritized data but also include an allotment of high-speed data. 

Premium unlimited plans provide unlimited high-speed data, with no restrictions on speed or amount.

What Is a Capped Plan?

By contrast, capped plans have a set limit on the amount of data you can use per month. Once you run out of that data, some plans cut you off entirely, while others put you on quite slow 2G/3G data. All capped data plans only include deprioritized data, so if you’re ever in a busy place like a sports area or a concert, you will most likely find that your capped data slows down. 

Capped data plans are most appealing to customers looking for a budget option, who don’t mind slower upload and download speeds on their mobile, and don’t need a lot of data while out and about. 

What About Hotspot Data?

It’s easy to get confused about where exactly hotspot data falls into unlimited data budgets.

In short, it depends on the carrier. Some plans offer a separate hotspot allowance. For example, AT&T might give you 50 GB of premium data per month, with an additional 10 GB of premium hotspot data. Using that 10 GB of hotspot data doesn’t impact the amount or speed of the 50 GB of normal premium data you have. Once those 10 GBs are gone, hotspot speeds will slow to a crawl until next month.

What about MVNOs? We’ve clarified that carriers that lease infrastructure from other carriers, like Xfinity does, can only ever offer deprioritized data. The infrastructure owner’s primary customers always get preference in busy times. That affects hotspot data, too. On Xfinity’s plans, you also get a separate budget for hotspot data. However, just like normal “unlimited” data, Xfinity can always slow you down. 

Other plans include hotspot data in your overall data allowance. Although data is theoretically unlimited, past a certain amount of use, the carrier can subject you to further slowdowns. When you use hotspot data in these types of plans, it counts against your data allowance. For instance, on some unlimited data plans, you may have 30 GB of deprioritized data before you enter the “further slowdowns” zone. Of that allotment, you can use up to 5GB for hotspot usage. Once you’ve used up those 5 GB, you'll only have 25 GB of data remaining, and if you try to use your “unlimited” hotspot, you’ll find that data speeds are effectively unusable.

This isn’t a deal breaker if you don’t use hotspots very often. But if you are a frequent hotspot user, this is an area to compare closely. 

Comparing Plans

AT&T vs Xfinity Mobile Capped Plans

Both carriers provide customers with capped data plan options. Xfinity Mobile’s “By the Gig” model charges customers a set amount per gigabyte of data. On the plus side, you have the option to share your data across all the lines on your account. For example, you could get on a plan that offers 10GB per month, and share that across your whole family. AT&T offers both prepaid and postpaid capped plans with a set amount of data. Those plans do not permit sharing data across multiple lines. 

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AT&T vs Xfinity Mobile Entry-Level Unlimited Plans

Let’s talk about entry-level options. If you’re in the market for a cost-effective plan that still gives you unlimited data, both AT&T and Xfinity have strong contenders. These plans are best for folks who don’t use a lot of data, and when they do use data, it’s primarily for checking emails, browsing socials, and maybe watching a YouTube video or two. Mobile hotspot usage is infrequent. If that’s you, check out these plans.

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AT&T vs Xfinity Mobile Mid-Level Unlimited Plans

What if you want at least some high-speed internet when you’re out of Wi-Fi range? If so, these mid-level unlimited plans could provide you with a possible option. These are a good compromise between the affordable prices of entry-level plans while still giving you a pretty good Mbps speed. If you consider yourself to be an average data user who switches on a Wi-Fi hotspot no more than three times per week, plays some mobile phone games, perhaps streams some Netflix shows, and limits social scrolling to an hour per day, these plans could be a good fit for your lifestyle. 

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AT&T vs Xfinity Mobile Premium Unlimited Plans

If you go to Xfinity’s website, you’ll see a “Premium Unlimited” plan. Despite the name, this isn’t truly premium data, because Xfinity Mobile only operates as an MVNO, without any of its own infrastructure. That’s why we don’t include that plan in this category because the data isn’t guaranteed to be high-speed. Xfinity Mobile can always slow down your data when networks are busy.

AT&T’s Premium Unlimited plan truly fits heavy data users who never want to experience slowdowns. That’s you if you often connect your phone as a hotspot,  you love watching live sports or streaming videos, you post plenty of content on social media, and you’re a big mobile gamer. In other words, if you don’t ever want to be slowed down, then AT&T’s Premium Unlimited plan below can keep up with your data needs.

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The Bottom Line

For a quick, simple comparison of not just Xfinity Mobile and AT&T, but all major carrier plans, our free, unbiased Plan Finder can help. Just answer a few questions like whether you want to bundle in extra perks, how much premium data you need, and whether you use your hotspot. We’ll sift through thousands of plans in seconds to find the right ones for you to consider. 

Still thinking about what factors to consider? Our article on how to choose the best cell phone plan can provide some clarity.

AT&T
4GB
$
50
/mo/1 line
Taxes and fees are not included
Taxes and fees are included
8
phone lines max
Data
4.0GB Premium data
hotspot
shared
None
perks
None
International
  • Unlimited talk, text, and data in Mexico and Canada (2G off net data speeds may apply).
  • Unlimited texting from US to 200+ countries.
None
Xfinity Mobile
1GB Plan
$
15
/mo/1 line
Taxes and fees are not included
Taxes and fees are included
8
phone lines max
Data
By the Gig Data
hotspot
shared
None
perks
None
International
None
Xfinity Mobile
3GB Plan
$
30
/mo/1 line
Taxes and fees are not included
Taxes and fees are included
8
phone lines max
Data
Capped Data
hotspot
shared
None
perks
None
International
None
Xfinity Mobile
10GB Plan
$
60
/mo/1 line
Taxes and fees are not included
Taxes and fees are included
8
phone lines max
Data
Capped Data
hotspot
shared
None
perks
None
International
None
AT&T
Value Plus VL
$
51
/mo/1 line
Taxes and fees are not included
Taxes and fees are included
8
phone lines max
Data
Deprioritized Data: Unlimited
hotspot
Not Supported
None
perks
None
International
  • Unlimited talk, text, and data in Mexico and Canada (2G off net data speeds may apply).
  • Unlimited texting from US to 200+ countries.
None
AT&T
Unlimited Starter SL
$
66
/mo/1 line
Taxes and fees are not included
Taxes and fees are included
8
phone lines max
Data
Deprioritized Data: Unlimited
hotspot
5GB LTE/5G
None
perks
None
International
  • Unlimited talk, text, and data in Mexico and Canada (2G off net data speeds may apply).
  • Unlimited texting from US to 200+ countries.
None
Xfinity Mobile
Unlimited Intro
$
45
/mo/1 line
Taxes and fees are not included
Taxes and fees are included
8
phone lines max
Data
Deprioritized Data: 20GB
hotspot
Unlimited 3G (slow)
None
perks
None
International
None
AT&T
Unlimited Extra EL
$
76
/mo/1 line
Taxes and fees are not included
Taxes and fees are included
8
phone lines max
Data
75.0GB Premium data
hotspot
30GB LTE/5G
None
perks
None
International
  • Unlimited talk, text, and data in Mexico and Canada (2G off net data speeds may apply).
  • Unlimited texting from US to 200+ countries.
None
Xfinity Mobile
Unlimited Plus
$
55
/mo/1 line
Taxes and fees are not included
Taxes and fees are included
8
phone lines max
Data
Deprioritized Data: 30GB
hotspot
5GB LTE/5G
None
perks
None
International
None
AT&T
Unlimited Premium PL
$
86
/mo/1 line
Taxes and fees are not included
Taxes and fees are included
8
phone lines max
Data
Unlimited Premium data
hotspot
60GB LTE/5G
None
perks
None
International
  • Unlimited talk, text, and data in Mexico and Canada (2G off net data speeds may apply).
  • Unlimited texting from US to 200+ countries.
  • Unlimited talk, text, and high-speed data in 19 Latin American countries.
None

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