The "unlimited" package that comes with a hidden number, and how to find it before paying

There's a way to run out of internet on a trip that doesn't come up in any conversation about roaming, because it doesn't fit the usual narrative.

It's not the person who forgot to turn off their data. It's not the person who relied on hotel Wi-Fi. It's the person who did everything right: intentionally purchased a travel package, paid in advance, and by the third day their phone is so slow that they give up trying.

There was no surprise charge. There was no mistake. They received exactly what was advertised.

The problem is that what's advertised and what's published are not the same thing.

No data plan is truly unlimited

It's good to start here, because it debunks half the issue.

No company in the world offers data with absolutely no limits. All, absolutely all, have a fair usage policy: an amount after which they reduce the connection speed.

The word that appears in the advertisement describes the absence of a cutoff. It's true that they don't cut off your service. What the fair usage policy does is leave the connection at such a low speed that, in practice, it's no longer useful for what you need.

So the useful question is never whether the plan is unlimited. The useful question is what the number is and where it's written.

Where the number is published

In the case of AT&T Mexico's international packages, the data is on their own website, in the same table where the price appears.

Their 5-day Preferente package costs 299 pesos and includes 2,500 MB. When that amount is exceeded, the speed is reduced to 256 kbps. The 10-day package costs 549 pesos with 5,000 MB, and the 17-day package costs 849 pesos with 8,500 MB. The packages for the World Zone follow the same logic with different prices.

Source: att.com.mx, international plans and roaming section. Prices include VAT.

None of this is hidden. It's published, on their website, next to the price.

What happens is that the word is in large print and the number is in a column next to it, and the word is what sticks in people's minds.

What 256 kbps means in real life

It's an abstract figure until you translate it.

At that speed, text messages still come through and notifications arrive. Almost everything else stops working properly:

• A map with real-time traffic takes so long to load that it's useless for walking.
• Scanning a menu code at a restaurant door can take several minutes.
• Sending a photo to family becomes a long wait.
• A video call is not viable.
• Loading a reservation confirmation from an app is slow and uncertain.

In other words, minimal communication survives, and everything that makes a phone useful for travel disappears.

How much data is actually used on a trip

This is the part that almost no one calculates beforehand, and it's what determines whether a limit is generous or tight.

As an approximate reference and for guidance, not as a promise:

• Map navigation with the screen on is one of the most constant uses of the day.
• Photos that automatically back up to the cloud can be the biggest consumption of the trip without you noticing.
• Videos and social media stories consume much more than messaging.
• Pure text messaging consumes very little.

From this comes a practical tip that works with any plan: disable automatic photo backup while traveling and leave it for when Wi-Fi is available. It's the adjustment that makes the most difference and almost no one touches it.

Why the word still works even if almost no one believes it

It's worth understanding why the entire category insists on the same adjective, because it explains a lot about the market.

A number forces comparison. If one plan states a specific amount and another states a different one, the buyer has to estimate how much they will spend, and that's work and creates fear of making a mistake.

An adjective eliminates that discomfort. It sounds like you don't have to think. And for someone going on a trip who wants to get the issue out of the way, not thinking is exactly what they're looking for.

The problem is that the peace of mind only lasts until the third day. And from then on, the traveler usually blames their phone, the area, or the hotel, because at no point were they told that there was a threshold. That's the true cost of the word: it's not that it deceives, it's that it leaves the user without the necessary information to understand what is happening to them.

From this comes a simple recommendation that applies to any provider. When an advertisement uses that adjective, it's worth looking for the number on the same page. If the number appears next to the price, the seller is playing fair. If you have to go three screens deeper to find it, that already says something in itself.

The other fine print: the destination area

There's a second variable that can outweigh the speed limit, and that's which zone the destination country belongs to.

Mexican operators do not apply a single international rate. In the published catalog, a 15 GB package for the United States, Canada, Latin America, and Europe coexists with a Rest of the World zone package of 20 MB for 6,000 pesos.

Source: international roaming rates published by Telcel and registered in the Rate Book with the Federal Telecommunications Institute.

The same traveler can purchase the same type of product for two different destinations and receive radically different things. That's why it's advisable to check the zone before buying the plane ticket, not after.

What to check before contracting any travel plan

A short list that applies to any provider, including this one:

1. What is the specific amount of data, in gigabytes or megabytes. If the advertisement doesn't state it, you need to look for it.
2. What happens when it's exceeded: whether the speed is reduced, if it's cut off, or if it switches to pay-per-use.
3. Which zone the destination country falls into.
4. When the days start counting: from the purchase or from the first use.
5. Does it allow sharing data with another device?
6. Who handles issues if something goes wrong, and through what channel?
7. Is the refund, if it doesn't work, in money or credit for another purchase?

The last two are the ones most people omit and the ones that matter most on the day something goes wrong.

The alternative: a number instead of a word

Opposite the model of the big word with the hidden number is the opposite model, which is to buy a specific amount and know it from the beginning.

Destination data plans purchased from Mexico before traveling work like this: a certain amount of gigabytes and a certain number of days, with a fixed price paid in advance. When it runs out, it runs out, and there are no open charges that could appear on the bill weeks later.

It's not a more generous model. It's a more legible model. You can do calculations with a number. You can't do calculations with an adjective.

In PuraSIM's case, there are some plans with a daily quota, and their label indicates the speed after the daily quota, precisely so that this data is visible and not two screens deeper.

Additionally, the days run from the first use at the destination and not from the purchase, and there are 180 days to install it. This allows you to buy it today, install and test it at home this week, and travel within two months without losing a single day.

This detail matters more than it seems for a reason that is not about price: installing the plan at home, with Wi-Fi and with days of margin, turns any problem into a twenty-minute nuisance. Installing it upon landing turns the same problem into the first night of the trip.

First of all, a ten-second check

It's advisable to verify that the device supports digital profiles before paying for anything. Open the dial pad and type `*#06#`. If a number called EID appears in addition to the IMEI, the device is compatible.

Two Mexican warnings: several Redmi and Xiaomi models sold in the country are the Latin American version and do not include the component, even if the international specifications for the same model say they do; and being unlocked is not the same as being compatible.

What to remember

• No data plan is truly unlimited. All have a fair use policy with a published threshold.
• In AT&T Mexico's international packages, that threshold appears next to the price: 2,500 MB for the 5-day plan, with a reduction to 256 kbps.
• At 256 kbps, messaging survives, and almost everything else disappears.
• The destination zone can radically change what you receive for the same type of product.
• It's advisable to look for the number, not the word, and check it before buying the ticket.

PuraSIM sells destination data plans that are purchased and installed from Mexico before traveling, with a fixed price, for over 200 destinations. Customer service is via email and WhatsApp, with people who respond in Spanish. There is no phone support.