Internet Data Caps: Who Still Has Them and What They Cost

If your internet plan has been on the account for a few years, there is a fair chance it still carries a monthly data cap, even though the provider's home page now says its plans are unlimited. Both statements can be true on the same account. Xfinity's own data FAQ, read on 16 October 2026, puts it in two lines: new plans "include unlimited data," and the 1.2 TB limit "only applies to older (legacy) internet plans." The question for a household that already pays a bill is not who sells unlimited data. It is which of the two your account is on, and what the overage line costs if it is the old one.

Every provider figure below was read from that provider's own support or policy page on 16 October 2026. These pages change without notice, and at two companies they already disagreed with sibling pages on the same site that day.

One company, two pages, two answers

Start with Comcast, because it shows the problem in its cleanest form.

The Xfinity data usage marketing page says: "All Xfinity Internet plans now come with unlimited data." A few lines further down, the same page says customers on previous plans "may have a monthly data cap" and that an older plan "may have a 1.2 TB data cap."

The Xfinity 1.2 TB data plan FAQ is narrower. Its exclusions list does not say every new plan is exempt. It says the cap does not apply to "New Xfinity Internet plans with speeds 300 Mbps or above," plus Internet Essentials, Prepaid, NOW Internet, Gigabit x10, and anyone who has added Unlimited Data or xFi Complete. Read literally, a new plan below 300 Mbps is not on the exclusions list. Only your account page can settle whether such a plan carries the cap.

The FAQ also lists where the cap has never applied to legacy plans: Connecticut, Delaware, Massachusetts, Maryland, Maine, New Hampshire, New Jersey, New York, Pennsylvania, Virginia, Vermont, Washington D.C., West Virginia, and parts of North Carolina and Ohio. If you live in one of those, a usage meter on your account is informational only.

Cox has the mirror image of this. Its data usage page, titled "Cox is now Spectrum," still states that "All Cox Internet plans include 1.25 TB (1280 GB) per month of data usage." But the page it links for details, Speeds and Data Plans, now serves Spectrum's pricing disclosure, and its row for "Data included with monthly charge" reads "Unlimited," with "No Charge" under "Charges for additional data usage." A Cox customer on 16 October 2026 could read both pages in two clicks and get opposite answers. The likeliest reading is that the second describes plans sold under the Spectrum name and the first describes what existing Cox accounts still have, but neither page says so. Treat the label for your own plan, and the meter in your account, as the only answers that bind.

Who still publishes a cap, in their own words

Here are the three large wireline providers whose own pages, on the read date, still describe a monthly allowance with a per-block overage charge.

Sources: Xfinity data plan FAQ; Cox data usage page; AT&T's Check your internet data usage and Monitor and manage internet data usage. All read 16 October 2026.

AT&T is the clearest about who is outside the cap. Its usage table gives "Internet 100 - 5000 and AT&T Internet Air" an unlimited allowance with no overage fee. It also lists older bundle arrangements: a combined bill for AT&T Internet and DIRECTV or U-verse TV, for plans purchased before 1 August 2021, carries unlimited data too. The AT&T table keeps a footnote that dates the current allowance: "Existing data allowances will automatically increase from 1TB to 1.5TB" in bill periods starting on or after 16 October 2022. If an old printout or a forum post says AT&T's cap is 1 TB, that is why.

Some names come off the list once you check their own pages. Sparklight's data calculator page carries the heading "Sparklight Internet does not cap data usage." Spectrum's disclosure, as quoted above, shows unlimited data with no charge for additional usage. Third-party comparison sites still list caps for both, and for several smaller cable companies, in figures that do not match what those companies now print. The provider's own page, read on a date you write down, outranks every aggregator.

One more place a cap hides: an add-on. On the same Spectrum disclosure, the line for the Invincible WiFi Service carries the note "Reduced speeds after 100GB/month." That is not an overage fee and it is not on the base plan, but it is a monthly data limit attached to something you pay for. Satellite and 5G home plans handle heavy use through priority data and deprioritization rather than per-block charges; those are covered in the real monthly cost of satellite internet and why 5G home internet turns an address down.

The grace periods are three different promises

The overage price is identical at all three companies: $10 for 50 GB. The forgiveness is not.

Xfinity's wording is the most conditional. The first time in a 12-month period, "Our current policy is that you get a courtesy month. You will not be charged, no matter how much you use. That policy is subject to change." The window is rolling: once a year has passed since the courtesy month, you have another one. The final sentence is the company reserving the right to stop.

Cox gives one courtesy: "If it's your first time exceeding your data limit, we'll apply a one-time courtesy credit to cover any overage charges for that billing cycle." No window is stated. Read as written, it is once per account, not once per year.

AT&T is the most generous on paper. Its notification schedule says that in the first bill period over the limit, "You'll get a notice, but we won't charge you." In the second, notices go out at 65%, 90% and 100%, and still no charge. Charges start in the third bill period over. AT&T does not say whether that count ever resets.

Xfinity's courtesy month is the only one with a clock attached, so note the date you used it. All three count how many times you have gone over, which means the provider's record of your history decides it. If an overage charge lands on what you believe is a courtesy month, ask in writing which earlier billing cycle they are counting as your first time over, and for the usage figures for it.

Where the $100 ceiling lands

A maximum monthly charge is also a usage figure: it tells you when extra use stops costing anything that month.

Ten blocks of $10 make $100. Ten blocks of 50 GB make 500 GB. So:

• Xfinity legacy: 1,200 GB allowance plus 500 GB means the bill stops growing at around 1.7 TB in a month. Past that, the rest of the month is effectively unlimited at a $100 premium.
• Cox: 1,280 GB plus 500 GB puts the ceiling at 1,780 GB.
• AT&T Internet, 1.5 TB tiers: 1,500 GB plus 500 GB, so 2,000 GB.
• AT&T DSL: the maximum is $200, which is twenty blocks or 1,000 GB over a 150 GB allowance. The DSL bill keeps growing until about 1,150 GB.

There is one wording difference that changes the small numbers, not the ceiling. Cox says it will "automatically add 50 GB for $10 each time you go over," which reads as whole blocks: one gigabyte over buys a full block. Xfinity says "$10 for each 50 GB over the limit," and AT&T says it will "automatically add more data in 50GB increments." Neither of those two spells out what happens to a partial block. If your statement shows a charge for a block that your own meter reading says you barely entered, that is the clause to quote back.

When unlimited costs less than overage

AT&T is the one provider of the three that prints its unlimited add-on price on the same page as its overage rate. Its list of ways to get unlimited data includes "the unlimited data usage add-on for $30 per month." The page does not say on that line which tiers can buy it, so confirm it is offered on your plan before counting on it.

Thirty dollars is three overage blocks. Three blocks cover anything from 101 to 150 GB over the allowance if partial blocks are billed whole. So, after the two free bill periods are used up, a household that crosses the 1.5 TB line by more than about 100 GB in a given month pays at least as much in overage as it would for the add-on, and more past 150 GB. A household that goes over by 20 GB twice a year comes out ahead paying the occasional $10.

The comparison with Xfinity is different, because the cleaner exit there is the one Comcast's FAQ names first: switch to a new plan, which on its own description includes unlimited data at 300 Mbps and above. A plan change can also move the price and any promotional period. Run that change against the steps in what happens to the bill when a promotion ends before accepting it on a call.

Neither Xfinity's FAQ nor Cox's data page prints the price of its unlimited option on the read date. Cox mentions "Unlimited and 500 GB Additional Data Plans" for "an additional monthly charge" without a figure. Get the number from your account or in writing before doing this sum.

The label has to state the allowance, including for a plan nobody can buy

The cleanest way to settle which allowance applies to you is the broadband consumer label for your plan, because the rules require that the cap and the overage be on it.

The FCC's 2022 label order (FCC 22-86, read 16 October 2026) says at paragraph 35 (paragraph 25 in the Federal Register printing) that providers "must disclose any charges or reductions in service for any data used in excess of the amount included in the plan," and that they must identify the increment, using "each additional 50GB" as the example. The order explains why: "limits on data usage is critical information for consumers." Spectrum's published disclosure uses the two field names you will find on most labels: "Data included with monthly charge" and "Charges for additional data usage."

The difficulty for a long-time customer is that the label for your plan may have disappeared from the provider's website when the plan stopped being sold. The rule covers that. Under 47 CFR 8.1(a)(5), as it stood on 1 October 2026 in the eCFR versioner (checked 16 October 2026), providers must keep archived labels for at least two years after a plan is no longer available to new subscribers, and "must provide an archived label, upon request and within thirty days, to an existing customer whose service plan is associated with the particular label." Paragraph (a)(2) separately requires a provider with an online account portal to make each customer's label "easily accessible" inside it.

So the order of operations is: look in the account portal for your plan's label; if it is not there, ask in writing for the archived label for your plan, and note the date of the request. Thirty days later you should have the document that states your allowance and your overage increment. The walkthrough of every other field on that document is in how to read a broadband nutrition label.

Do not leave that request for later. The FCC's July 2026 label order (FCC 26-48, adopted 22 July 2026 and published in the Federal Register on 13 August 2026, read 16 October 2026) says plainly: "We eliminate the requirement that providers archive all labels for at least two years after a service plan is no longer available to new customers" and its label has come down. Amendatory instruction 3 removes paragraph (a)(5) and narrows the portal duty to "each customer's current plan label." The DATES line says that instruction "is delayed indefinitely," with the effective date to be announced in the Federal Register. Until that notice appears, the thirty-day duty above is the rule on the books. After it, a provider can lawfully say the label for an old plan no longer exists. The order points customers to their service agreement, monthly bills and records of plan changes instead, so keep those too.

The same order keeps data allowances among the core label contents. It also adds a provision under which phone sales agents would orally summarize a short list of label fields, "data allowance" among them, but that provision sits in the same delayed instruction 3. On the read date it was not in force. Do not rely on a phone agent volunteering your cap.

Checking the provider's meter against a number you own

Each capped provider above offers a usage meter: the Xfinity app or xfinity.com/usagemeter, Cox's Data Usage Meter in My Account or the app, and AT&T's "See all usage" under Plan details. The meter is the provider's measurement, taken on its side of the line, and it is what the bill is built from.

Whether those meters are accurate is a question the FCC itself put to the industry without settling it. Its Notice of Inquiry on data caps (FCC 24-106, WC Docket No. 23-199, adopted 2 October 2024, released 15 October 2024) asked: "How accurate is the data usage information they receive? Are customers provided actual data usage or estimates?" The same document cites a summary finding that about 48.9% of Affordable Connectivity Program subscribers were on plans with some form of data cap. As of 16 October 2026, no rule on caps has come out of that inquiry.

You can produce your own comparison figure without any special equipment:

1. Find a byte counter you control. Many routers and gateways show total bytes sent and received on the WAN or internet interface, on a status or traffic statistics page.
2. Write down both numbers on the first day of the billing cycle. The provider's meter reading, and your router's WAN total. The billing cycle start date is on the statement.
3. Take the same two readings once a week, at about the same time. Store them with the date and time in one sheet. If the router reboots, note it and start a new baseline from that point.
4. Compare the change, not the totals. What matters is whether the meter's weekly increase tracks your counter's weekly increase. Small differences are expected; the two count at different points. A gap that grows week after week, or a meter jump on days the household was away, is something to raise.
5. Keep the provider's alerts. Xfinity sends email at 75% and email and text at 90% and 100%, then again when overage reaches $50 and $100. AT&T sends notices at 65%, 90% and 100%, and says it will send a letter "using U.S. mail" if it cannot reach you by email. The timestamps on those alerts are the provider's own readings, made at a known moment.

Xfinity's FAQ also offers a reference point: most customers stay "around 498 GB per month." That is the company's own average, not a target, but it tells you how far above typical a month near the cap is.

Disputing an overage line

A dispute about overage is a billing dispute, and the general rules for those apply: your service agreement sets the deadline for challenging a charge, a phone call usually starts no clock, and the record you keep decides what happens next. The full sequence is in how to dispute an internet bill charge.

What is specific to data caps is the evidence. A strong written dispute for an overage charge carries four things: the archived label or portal label showing your allowance and increment; the provider's meter readings for the cycle, with dates; your own weekly counter readings for the same period; and, if it is your first time over at Xfinity or Cox, or your first or second bill period over at AT&T, the grace clause quoted from that company's page with the date you read it. If your plan's label says unlimited and an overage line still appears, the label is the whole case.

If the provider does not resolve it, the next stop is the FCC's informal complaint process or your state's consumer office, covered in where to complain about an internet provider.

Before the next billing cycle starts, open your account and find the plan name, the label, and the usage meter. If the label is missing, send the written request for your archived label that day and put the date thirty days out on the calendar. On the first day of the cycle, write down the meter reading next to your router's WAN total.