Horizon sells no Central America plan and no Latin America plan. There is no regional page to open, and the absence is deliberate: on the isthmus, every destination is bought on its own. Mexico is one plan. Guatemala is a different plan. Costa Rica and Panama are two more. What decides where an allowance applies is the territory written into the offer you selected, not the shape of the land and not the label above the button.
Why one strip of land reads as one product
Between the Yucatán and the Colombian border the land never stops, and neither does the language we use about it. Flight search groups the whole strip under one heading, and tour operators sell three countries as a single holiday. Buses really do cross a national line in an afternoon, and someone who spent the morning in Guatemalan highlands and the evening in Mexican ones can be forgiven for expecting a phone to treat the day as one trip.
Mobile products are drawn the other way round. Each country has its own operators, its own agreements and its own listing, and an offer exists for exactly the destinations written into it. Being next door extends nothing. "Central America" is a phrase from the language of travel, not the name of a product.
Read the list, not the label
The method takes about a minute and works on any seller's page.
- Open the specific offer rather than the shop front. A headline number belongs to the shop front; the destinations belong to the offer.
- Find the territory the offer names, which is a written list of places rather than a region.
- Read your route against that list, country by country, by name. A country nobody wrote down is not part of what you are buying.
- Treat "Latin America", "the Americas" and "Central America" as adjectives until a list stands behind them.
- Set the validity window against the days you will really be in that one country.
The fifth step catches more people than the first four: a route down the isthmus splits a fortnight into three or four stays, and a window bought for the whole holiday spends most of itself elsewhere.
What the catalogue lists today, and what it does not
The clearest view of the shape is the country directory for Mexico and Central America, which says in its own words that no LATAM or Central America package exists and that every link on it opens a separate country page. It names Mexico, then Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica and Panama. A destination appears there only while an approved country plan is live, so the page describes the catalogue on the day you read it, not a permanent map.
Belize is not on it, and there is nothing here to buy for Belize at all. Better known before that day goes on the calendar than after.
The destination pages follow one shape. Mexico opens with a small size or two on a seven-day window, then a group of larger sizes on thirty days, with one more rung at the top of its ladder than the others carry. Costa Rica, Panama and Guatemala repeat that two-part pattern, and the sizes are not identical across the four.
A Yucatán trip with a day in Belize
The commonest version of this question arrives from the Caribbean side: a stay near Tulum or Bacalar, then one day south over the road below Chetumal, or east out of Flores through Melchor de Mencos if the route came the other way about. Neither sits inside a Mexican purchase, because a Mexican purchase ends where Mexico does.
Belize has nothing here to fall back on, so the preparation is the older kind. Pull the return times, the meeting point and tonight's address onto the handset while you are still on a connection you trust.
Two smaller things follow. A Mexican validity window carries on spending its days while you are over that line, so a short window and a mid-trip excursion sit badly together; check the window on the offer before building the day in. And on the way back nothing needs reinstalling.
Costa Rica and Panama, the pair that gets bought as one
No two countries on the isthmus are paired as often as these. A fortnight taking in San José, La Fortuna under Arenal and the Monteverde cloud forest, then carrying on to Bocas del Toro or the Panamanian capital, crosses a national line in the middle of itself: at Paso Canoas on the Pan-American Highway, or over the Sixaola bridge on the Caribbean side.
That crossing changes which listing applies, which makes it two purchases and two sizing decisions. Nine days of mountain driving is a different number from four days around a capital. Costa Rican distances argue for the larger side of the choice, since San José to La Fortuna is only about 130 to 140 kilometres and still takes three hours or more. Panama says the same to anyone leaving the capital: Boquete lies 480 to 490 kilometres out along the Pan-American Highway, and Bocas del Toro is reached by boat.
Overland from Guatemala into Mexico
The route north is the other one worth planning at the table. Highland travellers cross at La Mesilla into Ciudad Cuauhtémoc and carry on toward San Cristóbal; anyone joining Flores to Palenque takes the river instead, on the Usumacinta at Frontera Corozal. Both are long days out of short maps: Antigua sits roughly 39 kilometres from Guatemala City and still costs an hour or more of mountain highway.
So have the Mexican profile on the handset before the crossing rather than after it. A border post is the least convenient place on the route to be installing anything: you are on foot between two windows, holding paperwork, with a queue behind you.
Tip: Do the installing the evening before, on the accommodation connection in Flores or Antigua, and keep the second line dark until the stamps are done. Whether the clock on an offer starts at installation or at first registration differs from one product to the next, so read that line on the page before choosing the evening.
Panama City as a connection rather than a country
Plenty of itineraries touch Panama only in transit. The airport sits about 24 kilometres east of the city, half an hour to forty-five minutes away depending on traffic. If the layover stays inside the terminal, there may be nothing here worth buying: decide by whether you come out through immigration, not by whether the aircraft lands.
If you do come out, a long layover in Casco Viejo or a run up to the Miraflores Locks is what the small seven-day sizes are for. The ladder has a bottom rung for a reason.
Short answers
Is there a Central America eSIM? Not here. Horizon has no Central America and no Latin America package; the regional page you will find is a directory of separate country plans, not a plan of its own.
Does a Mexican plan reach Guatemala or Belize? Only the destinations printed on the offer belong to it. Guatemala has its own plan; Belize is not sold at all today.
Do Costa Rica and Panama need two plans? Yes. They are two listings, each sized by the days that country gets, not by how long the holiday runs.
What if my route touches four countries? Then you read four territory lists and four validity windows, which is a five-minute job at the kitchen table and a bad one at a border post.
What actually decides where my allowance applies? The list of destinations printed on whatever you bought, every time. Nothing along this stretch of map is included for being next door.
