How to tell in ten seconds if your phone supports eSIM, and the two Mexican cases that confuse everyone

This is the question most people ask before buying data for a trip, and the one with the fewest clear answers: does my phone work for this?

Almost every article and video on the topic starts at step three, which is how to install the profile. Nobody stops at step zero, the only one that matters if you haven't paid anything yet.

You can get the answer in ten seconds, right on your phone, for free and without installing anything.

The code: `*#06#`

Open the phone app, the dialer, and type `*#06#`. You don't need to press the call button. Just typing it makes the screen appear on its own.

What comes up is a list of the device's identifiers:

• IMEI, the serial number that's been around forever. Every phone has one.
• EID, a longer number that identifies the built-in chip.

If EID shows up, the device supports digital profiles. If it doesn't, it doesn't support them.

That's it. No need to give out personal data, no need to download apps, and no need to ask anyone in a store.

The first confusing case: Redmi and Xiaomi phones sold in Mexico

This is the detail that causes the most surprises in the country and the one almost no international article mentions.

Several Redmi and Xiaomi models sold in Mexico are the Latin American version, and that version doesn't include the component, even though the same model does have it in its global version.

In other words: you can look up the manufacturer's specs, read that the model supports it, and still be holding a phone that doesn't.

Same name, same box, same screen, different insides.

That's why checking with `*#06#` isn't optional for anyone with one of these devices. It's the only reliable way to know, because the manufacturer's spec sheet can be correct and still not apply to the device you bought here.

The second confusing case: unlocked is not the same as compatible

These are two different concepts, and many people use them as synonyms.

Unlocked means the phone isn't restricted to a single carrier. It's a matter of commercial lock.

Compatible means the device physically includes the component that allows loading a digital profile. It's a matter of hardware.

That gives four possible combinations, and two of them are surprising:

• Unlocked and compatible: it works.
• Unlocked but without the component: it doesn't work, no matter how unlocked it is.
• Has the component but is locked by the carrier: it doesn't work until it's unlocked.
• Neither one nor the other: it doesn't work.

If `*#06#` shows the EID, the hardware is there. If the device was bought unlocked or is already unlocked, there's nothing else to check.

The other usual doubt: will I lose my number and my WhatsApp?

It's the second most common question, and the short answer is: no.

The confusion comes from the mental model of a plastic SIM, where one goes in and another comes out. Digital profiles don't work that way, because they don't use the physical slot.

Your Mexican SIM stays where it is. The phone holds both lines at the same time, and each one does its own thing:

• Your Mexican line stays active to receive calls and messages. Your bank codes still come through there.
• Data, meaning internet, goes through the new profile.

And WhatsApp doesn't live on the SIM: it lives in your account, which is tied to your number. If the number is still in the phone, the account stays the same, with the same groups and the same conversations. The only thing that changes is where the data travels.

Devices that are usually compatible

As a general reference, most mid-range and high-end devices released from 2018 onward support it. For PuraSIM, compatibility has been verified from iPhone XS and Galaxy S20 onwards.

That said, the list of models changes constantly and there are regional exceptions like the one just described. So no list replaces checking with `*#06#` on the actual device you have in your hand.

What to do if your phone is not compatible

If no EID appears, there are three reasonable paths, and it's worth knowing them before spending money.

The first is to use a local physical SIM at your destination, accepting the hassle: waiting in line, showing your passport, and in some countries a registration that can take hours. And swapping out your local SIM for the trip.

The second is to buy a roaming package from your own carrier, first checking which zone your destination falls into, because the difference between zones is huge.

The third is to take advantage of another device in your household that is compatible and share data, first verifying that the plan allows it, because not all do.

None of the three is ideal, but knowing this before you travel is infinitely better than finding out in a hotel room at eleven o'clock at night.

Why it's worth checking today, not the night before your flight

There's a practical reason that goes beyond compatibility.

When a digital profile is installed upon arrival at your destination, any problem happens in the worst possible scenario: no network, no time, no language, and no backup plan.

When it's installed at home, on your own Wi-Fi and with days to spare, the exact same problem becomes a twenty-minute annoyance with the option to fix it calmly or request a refund without having left the country.

The risk doesn't disappear. It just moves somewhere else, and that shift makes all the difference.

This only works if the plan doesn't start counting down the moment you buy it. With PuraSIM the days run from first use at your destination, not from purchase, and you have 180 days to install it. So you can check, buy, and install today, and travel two months from now without losing a single day.

What installation looks like in practice

It helps to know what to expect, because a lot of the fear comes from imagining a process much more technical than it really is.

After purchasing, a QR code arrives by email and WhatsApp. In a recent real order, the payment was recorded at 11:08:34 and the message with the QR went out at 11:08:44.

From your phone, on your home Wi-Fi, go to the mobile network settings and choose the option to add a line. Scan the code or enter the data manually if you're using the same phone where the email is. The profile downloads and appears as a second line in the list.

From there, there are only two things to check:

1. That the new line is selected as the one used for data.
2. That your local line remains active for calls and messages.

On most devices, that's it. On some Androids you need to confirm a network detail that the guide itself tells you. And in no case do you have to remove anything from your phone.

Frequently asked questions

Does the plan get used up just by installing it at home?

No, the plan counts days from first use at your destination. That's exactly why you can install it days in advance at no cost.

It's a good idea, though, to leave it installed but not set as your active data line while you're still in Mexico, so your phone keeps using your regular network until the trip.

Can I have several lines saved?

Most modern devices let you store multiple profiles and have one active at a time. In practice, that means a plan from a previous trip can stay saved without getting in the way.

What happens if I change phones?

A digital profile is tied to the device it was installed on. If you're switching phones, it's best to sort it out before you travel, not after — another reason not to leave this until the last day.

Does it work for regular phone calls?

Data plans don't include a local number. Calls are made through messaging apps. This is the most important limitation of this category, and it's worth being clear about it from the start, especially if your trip involves any procedures that require a local phone number.

What if the device is old but does show an EID?

If it shows an EID, it works. The age of the model matters less than whether the component is present. Some devices from several years ago have it, and some recent devices from certain regional versions don't.

Key takeaways

• Dial `*#06#` on your phone. If an EID appears, the device works.
• Redmi and Xiaomi phones sold in Mexico may be the LatAm version without the component, even if the manufacturer's spec sheet says otherwise.
• Unlocked and compatible are two different things, and you need to check both.
• Your Mexican SIM card stays in place. Your number, WhatsApp, and bank messages all stay the same.
• It's best to install and test at home, on Wi-Fi, a few days before you fly, not when you land.

It's a ten-second check that avoids the most expensive and most inconvenient problem of all: finding out the answer five thousand miles from home with your money already spent.

PuraSIM sells data plans by destination that you can buy and install from Mexico before you travel, with a fixed price, for over 200 destinations. Customer support is by email and WhatsApp, with people who respond in English. There is no phone support.