Not on the strength of the name, no. Horizon lists the United States, Canada and Mexico as three separate country plans, each with its own page and its own written territory, and it is that written territory — on the plan you actually buy — that settles where an allowance applies. Not the continent. Not the phrase North America. Not how brief the hop is. So if a morning in Ontario or an afternoon in Tijuana is already on the calendar, budget for a second purchase and do the reading at a kitchen table rather than in a queue of cars.
That is the answer. What follows is why the question keeps being asked, a check you can run on any store before paying, an honest account of where our own three plans stop, and the practical version for a Niagara day, a border walk at San Ysidro and a route with legs on both sides.
Why the question keeps being asked
Because these borders sit inside ordinary itineraries and behave like suburbs. Niagara is a couple of hours from Toronto, and the falls get looked at from Ontario and photographed from New York. Seattle and Vancouver are a morning apart on one highway. Tijuana is reached from San Diego on a tram and a turnstile. None of those days feels like international travel until something asks which country is being billed.
The product is drawn on the other set of lines. A travel data plan exists because agreements were made one country at a time, so a country is the unit that ends up for sale, even when the trip refuses to respect it. That mismatch is the whole of the confusion.
The check that takes a minute, on any store
Before paying anyone, ours included:
- Open the plan, not the destination page. A destination page sells a place; the plan carries the terms that bind.
- Find the field that names places — a territory line, a list of included countries, whatever the store calls it. If a listing has no such field at all, that absence is itself the answer.
- Look up every country your route touches, by name. A country is written on that list or it is absent, and a regional word is not a substitute for the entry.
- If the route also touches an island or an overseas territory, look that up by name too. Our own USA page takes the question head on for Guam, Puerto Rico and the US Virgin Islands.
- Screenshot what you were shown. Reopening a checkout page is easy from home and awkward from a lane at a crossing.
It runs to about a minute, and it is the same minute in every store. The point is not suspicion. It is that "USA" is a name, while a territory line is a specification.
Where our own three plans stop
Three plans, three pages, three territories: the USA eSIM, the Canada eSIM and the Mexico eSIM. Each page prints its own ladder and its own boundary, and each meets the neighbour question in its own questions section rather than leaving you to infer an answer from a map.
The ladders themselves show that these are three products. The American list runs from week-long rungs measured in megabytes, through 3, 5, 10 and 15 GB at thirty days, up to long-window tiers of 20 GB and 50 GB, and it is not a closed list: the page itself shows the rungs currently sold. Canada's largest rung is 75 GB and Mexico's is 50 GB, both on a thirty-day window. Three ladders that different are not one product wearing three names.
Adding a country in the basket does not stretch the first plan either: each destination becomes its own eSIM, sitting beside the others in the app. There is no North America bundle in the catalogue — the regional shelf holds Europe, the Balkans, the Caribbean, the Middle East, Asia Pacific and the Caucasus, and nothing spanning these three. Broader regional and global listings do name the countries they include on their own pages, so read those entry by entry before treating one as a shortcut.
A border day, from the side you started on
For a Niagara day out of Toronto, the crossing is the Rainbow Bridge and the day is mostly Canadian: Ontario for the drive, the parking and the view over Horseshoe Falls, plus an hour on the New York bank if the plan is to look back. Size the Canadian plan for the Canadian days. The American hour is either a small rung of its own or an hour spent on somebody's Wi-Fi, and both of those are honest answers.
Seattle to Vancouver is the same problem at highway speed. Interstate 5 becomes Highway 99 at the Peace Arch, the drive takes a morning, and the billing changes at a line drawn through a lawn. San Diego to Tijuana is the shortest version of all: leave the car in California, walk through San Ysidro, be back for dinner — and the phone has still spent an afternoon on the far side of a territory list.
A route with legs on both sides
Some itineraries stop pretending. A coast-to-coast drive that ducks through Ontario between Detroit and Buffalo, a mountain loop that runs Calgary to Banff by way of Montana, a Cancún fortnight that flies home through Texas: two lists, one holiday.
Two ways of buying make sense. Two country plans, each sized for its own days, is the simpler arrangement and usually the tidier one, because the far-side days are typically few. The alternative is a broader listing whose page names every country on the route, which is worth comparing when the split is closer to even. Compare them on days rather than on totals: a fortnight in the States with one Canadian afternoon in it is not really a two-country trip.
Tip: On all three ladders the smallest rungs run seven days, so a single crossing does not need a month-long plan. Buy the short one against the date you cross rather than the date you flew, and read the listing for the event that opens its window.
What a change of planes counts as
An American connection on the way to Cancún is a real leg in a real country. Passengers arriving in the United States are sent through immigration even when the ticket carries on somewhere else, which leaves you landside, with luggage and a wait, at an airport that is not your destination. Whether that hour needs mobile data at all is a fair question — terminals generally have Wi-Fi, and an hour is an hour. What you should not do is assume the Mexican listing is doing any work for you while you stand there.
The same applies flying home through Seattle, and to a cruise out of Los Angeles that calls at Ensenada. Each stop belongs to whichever list names it.
Short answers
Does a plan sold for the United States include Canada or Mexico? Only where the listing names them. Here they are three separate plans, so a border day is a second purchase.
Is a Niagara day out of Toronto Canadian or American? Mostly Canadian. The New York bank is worth an hour, not a fortnight, so size it that way.
Does an airport connection in the United States count as a stop? Yes. Arriving passengers are sent through immigration there even when they are only changing planes.
What about Puerto Rico or Hawaii? Read them off the territory line rather than off the word USA. Our USA page answers that one directly.
Which plan should I buy first? The one for the country you are in longest, then the second, sized for the days it actually has to work.
Once both are settled, the order of operations for the American one is laid out step by step in the USA set-up guide, and the current sizes, windows and written territory sit on the USA eSIM page.
