Two weeks on the Riviera Maya, a week of museums in Mexico City, a longer loop through the interior: the answer has the same shape every time. Most travellers finish a week in Mexico on about 5 GB and a fortnight on about 10 GB. Keep the phone in your pocket between meals and 3 GB covers the week. Send video home every evening or share the line with a laptop, and budget 20 GB for the fortnight rather than a number you ration by day nine.
What a week costs, and what a fortnight costs
A city week is the lightest shape. Museums, markets and a couple of neighbourhoods, with evenings on the hotel connection: 3 GB if you are mostly reading, 5 GB once the group chat gets photographs every afternoon.
A fortnight on the coast with day trips is the middle. Playa del Carmen as a base, a crossing to Cozumel, a cenote morning, a day at Tulum — closer to 10 GB, because every leg is arranged on the phone and belongs to a different company.
A longer route through the interior stays in that band for two weeks and climbs toward 20 GB for three or four: joining Mexico City with Guadalajara, the road hours are what add up, not the cities.
Why a Mexican itinerary asks more of the phone
The first is distance. Mexico City to Guadalajara is a flight or the better part of a day on the road, and the Riviera Maya is a coastline rather than a town. One afternoon can involve a bus, a pier and a taxi held together by a booking reference, each looked up twice.
The second is that the arranging is done in writing. The driver, the host and the dive shop all reach you in a chat thread, usually with a photograph of the meeting point, and you answer with one of your own. Text weighs nothing; the photographs and voice notes are the real spend.
The third is the capital's scale. Crossing Mexico City means a ride app open for a while and a map you would never need at home.
Test it against the screen your phone already keeps
Your handset has been counting for months. Both major systems keep a per-app breakdown of mobile data for the last month, on iPhones in the mobile-data settings and on Android under network and internet. Open it, ignore the total, and re-weight the three lines that do the same work in Mexico.
- The map app. Whatever it shows at home is a floor: there you know the way, and a fortnight of unfamiliar junctions is several times that.
- The messaging app. The line that decides the trip, carrying meeting points and photographs in both directions.
- Video and music. Usually the largest number on the screen and the easiest to move: point both at the property's connection for downloads.
Add the three figures, multiply by the weeks away, then add a quarter for the days below. That total beats any table: it is built from your own habits.
The days that cost double
The arrival. Benito Juárez has two terminals with separate pickup points; at Cancún the terminal, the strip of hotels and your own address are three separate places. The first hour goes on notices, a pickup and telling somebody where you are.
The ferry day. A morning that leaves Playa del Carmen, crosses to Cozumel and returns is four or five timetables, and pier departures move with the weather.
The long highway leg. Hours on the road with a map running and an audio app filling the gaps, which is how a fortnight's allowance vanishes in an afternoon.
The day the plan changes. Rain shuts the cenote, a road closes, the return leg moves. Rearranging a day costs more than arranging it, and never happens near a password.
Choosing from the sizes Mexico actually lists
The live list for Mexico runs from a 1 GB week through 3 GB, 5 GB, 10 GB and 20 GB to a 50 GB top, with the days attached: seven for the smallest, fifteen for one 3 GB option, thirty for the rest.
A city week of museums and restaurants fits 3 GB, or 5 GB with room to spare. Two weeks of almost anything — coast, interior, or one of each — is what the 10 GB tier that runs thirty days exists for, and it is the sensible place to start. Step up to 20 GB if a laptop is joining the phone or three of you live off one line; 50 GB suits people working through the trip rather than travelling through it.
Where the selected plan supports a top up, adding data to the profile already on the phone is less trouble than starting over in a lobby with a bus to catch.
Tip: Count the days the way a plan counts them, from the evening you switch the line on to the morning you fly home, not by the nights you booked. A fortnight on the coast with a Mexico City night at each end is sixteen or seventeen days, and this ladder has one fifteen-day rung before thirty.
Once the size is settled, the order of operations is its own subject: the Mexico set-up guide covers the handset checks, the install at home and the switchover on arrival.
Four habits that keep the number down
Do the day's downloading at breakfast, on the property's connection: the playlist for the coach, the podcast for the highway. Entertainment is the heavy file, and the one thing that waits.
Send one photograph now and the album tonight. A running commentary in images from a cenote is the most expensive way to tell a story they will hear anyway.
Choose voice notes over video calls while you are out. Mexico sits far enough behind European clocks that the call home lands at the end of your day.
Turn off the camera roll's automatic upload for the trip. Two weeks of photographs is the biggest thing a phone will try to send, and it tries while you sleep.
When Mexico is one leg of something longer
A plan listed for Mexico is a plan for Mexico. A day trip into Belize out of Chetumal, a bus running south to Guatemala, a flight with one end in the United States: each is a separate country with its own listing, and none is included for being close. Gigabytes unused here do not become data in Belize.
So plan the way the listings are drawn. For a route carrying on south, each neighbouring country is sold on its own terms, which is what the directory for Mexico and Central America is for. Deciding that at the kitchen table is easier than at a border post.
Short answers
Will 5 GB see out a week in Mexico? For a city week with evenings on a hotel connection, yes, comfortably. For a week that moves every second day, 10 GB is calmer.
How much for two weeks on the Riviera Maya? Around 10 GB for most people, 20 GB if a laptop shares the line or video goes home daily.
Does one plan cover Cancún and Mexico City? Both sit inside the listed territory. What differs is local conditions and the building you stand in, which no amount of gigabytes changes.
What happens if I run out halfway? Where the selected plan supports a top up, extra data lands on the profile you installed at home. Read that line on the product page before you count on it.
