Does AT&T Work in Mexico? Coverage, Speeds and Costs by Plan

On a plan that leaves Mexico out, a HelloRoam Mexico travel eSIM puts your maps, ride apps and WhatsApp on Telcel or AT&T Mexico once you land. Those are the two networks our catalog listed for every Mexico plan on November 8, 2026. On a postpaid line, texts to your AT&T number still arrive, and AT&T doesn't charge a Day Pass fee for texts you receive.

Every AT&T price and rule below comes from AT&T's own plan, Mexico, prepaid and support pages and its International Travel Guide, which we read on November 8, 2026. AT&T updates these terms from time to time, so confirm your plan with AT&T before the trip. If you're on T-Mobile or Verizon instead, our guides to T-Mobile in Mexico and Verizon in Mexico cover those plans.

AT&T Unlimited plans include Mexico talk, text and data at no extra cost

The clearest line sits on AT&T's pay-per-use rates page: "Every AT&T Unlimited plan includes unlimited talk, text and data in and between Mexico & Canada." That covers Value 2.0, Extra 2.0, Premium 2.0 and Elite 2.0, and you don't need a new SIM card or any setup. On an older unlimited plan, check yours in your AT&T account before you go, because AT&T's Canada and Mexico roaming page says the benefit is "Included with select plans." Our guide to using AT&T in Canada covers the same plans north of the border.

Get your Mexico eSIM before you flyInstall it at home, then turn on data roaming for it when you land. From $3.37.See Mexico plans

The table sorts AT&T lines by what they get in Mexico, using AT&T's plan, prepaid and Day Pass pages.

Your Mexico data comes out of the same plan you use at home. AT&T's Mexico page says your plan's data limits apply there just as they do in the US. On Value 2.0, for example, AT&T may slow your data when the network is busy once you pass 5GB in a bill cycle. Elite 2.0's 20GB limit on international data each bill cycle doesn't apply in Mexico.

AT&T coverage in Mexico runs on partner networks and can slow to 2G

In Mexico, your AT&T phone roams on other companies' networks. AT&T's Mexico page says it contracts with carriers and providers there, that not all of them offer the same speeds, and that speeds vary by location.

The 2G warning runs through AT&T's pages. Its plan terms say 2G off-net data speeds may apply in Mexico. Its International Travel Guide, downloaded on October 27, 2026, flags Mexico for data that may be slowed to 2G on certain networks. The only other entries with that flag are Cuba, Lebanon and cruise ships. AT&T says a slowdown like this usually means the network you're on lacks 3G.

AT&T's service agreement goes further. It reserves the right to cut roaming data to 2G or other speeds, or switch it off, at any time and without notice, no matter how little you've used that bill period.

On 5G, AT&T's own pages disagree. The travel guide lists 5G in select Mexican locations for phones that use band n78. The Mexico page says 5G service "is not available in Mexico." So don't plan your trip around 5G on your AT&T line.

One more mix-up to avoid: searching for AT&T Mexico brings up att.com.mx, AT&T México's site for Mexican phone plans. Your US line doesn't need anything from it.

Plans without Mexico pay AT&T $12 a day or pay-per-use rates

A postpaid plan that leaves Mexico out still works there. If the line has no other international feature, AT&T switches on International Day Pass the first time you use the phone in Mexico and texts you that it did. You can opt out from that text, or drop the pass later by texting NO to 8048.

Each $12 pass runs 24 hours from the first call you make or answer, text you send or data you use there. Texts you get don't start one. A second line used the same calendar day adds $6, and no line pays more than 10 fees per bill cycle. In practice, five days of use cost $60 for one line and $90 for two, and 12 days in one bill cycle stop at $120 for one line. If anyone in your group is on Verizon, our guide to Verizon TravelPass shows that carrier's daily charge for Mexico.

Opting out doesn't make Mexico free, either. Without a pass, AT&T's pay-per-use page bills calls in Mexico at $2 a minute, $1 for each text you send, $2 for each picture or video message and $2.05 per MB of data. At that rate, 50MB costs $102.50. The Day Pass terms still quote older rates of up to $3 a minute and $0.50 a text. AT&T's Cruise Day Pass terms say standard international rates changed on May 6, 2026, to the figures the pay-per-use page shows, so plan on those.

Our guide to what AT&T charges abroad covers the cap, cruise fees and opt-out in more depth. To see AT&T next to Verizon and T-Mobile, read how US carriers bill roaming.

AT&T Prepaid works in Mexico only on plans that include it

AT&T's service agreement says international data roaming isn't available on AT&T Prepaid, except on plans that include use of plan data in Mexico and Canada. On AT&T's prepaid plans page today, that means Unlimited Enhanced Plus and Unlimited Ultra. Each lists "Mexico and Canada included" among its features. Unlimited Saver and the other plans there have no such line.

AT&T's Mexico page describes the prepaid rule by price instead: plans of $50 a month or more get talk and text in Mexico, and $65 or more adds data. That doesn't match today's lineup, where Unlimited Enhanced Plus costs $45 a month, so go by the plan's own feature list.

Don't count on the prepaid International Travel Add-On either: AT&T's country list for it skips Mexico. And the 12-month prepaid plan's "Calls to Canada and Mexico from the U.S." covers calls you make from home, not using the phone in Mexico.

AT&T Build-A-Plan, the online single-line plan, doesn't mention Mexico on its plan page and says add-ons like International Day Pass aren't available right now. Ask AT&T before you count on one in Mexico.

Dialing from Mexico on AT&T: +52, 10 digits and a Wi-Fi Calling catch

On an AT&T Unlimited plan, calls within Mexico, calls back to the US and calls from the US to Mexico are all included. Texts up to 1MB sent within and from Mexico are unlimited too, though AT&T's Advanced Messaging doesn't work there. A call from Mexico to a third country, say the UK, may cost international long distance rates.

Calls home take +1 and the 10-digit US number. Reaching a Mexican hotel or tour guide takes +52 and its 10-digit number. If your keypad has no + sign, press and hold 0 until it appears.

Skip the extra 1 that AT&T's Mexico page still adds after +52. Mexico moved every number to 10 digits on August 3, 2019. Its Federal Telecommunications Institute (IFT) set one format for callers outside the country in its 2019 guidance: 52, then the 10-digit number, whether it's a landline or a cell phone.

Watch Wi-Fi Calling. AT&T's service agreement says Wi-Fi calls to US numbers cost nothing extra from anywhere, but international roaming rates apply when you call non-US numbers over Wi-Fi while you travel. On an Unlimited plan, call that Mexican hotel with Wi-Fi Calling turned off, so the call goes over the cellular network your plan covers.

For police, fire or an ambulance in Mexico, dial 911. The Mexican government's 911 page calls it the country's single emergency number, and the IFT says the 10-digit switch didn't change it.

A Mexico cruise bills AT&T's at-sea rate between ports

Your plan's Mexico coverage doesn't reach the open sea. There, the phone joins the ship's own cellular network, which AT&T's Day Pass terms say is generally available 6 or more nautical miles from land. AT&T's terms say it adds Day Pass automatically when you first use the phone there. At sea, that costs $20 a day per line, with no discount for extra lines and no 10-day cap. A day with use both at sea and on land costs one $20 fee.

In port, AT&T's cruise terms say the ship's network switches off and service comes from the nearest country. So a port day when you use the phone only ashore in Mexico runs on your plan's Mexico coverage. Elite 2.0 lines pay $15 a day at sea for Cruise Day Pass instead, and can remove it by texting NO to 8052.

On a ship outside AT&T's list of 400+ cruise ships, pay-per-use applies: $4 a minute and $2.05 per MB. To skip a sea day's fee, AT&T's Day Pass page says to turn off Wi-Fi Calling as well as switching to airplane mode.

AT&T says it has no 50/50 rule for long stays in Mexico

If you winter in Mexico or work remotely from there, the real question is how long you can roam. AT&T's Mexico page says that if you use your phone more in Mexico than in the US, "Nothing!" happens: "Other carriers have a 50/50 rule that controls how much time you can spend on your phone in either country. AT&T doesn't."

Its consumer service agreement still lets AT&T limit, suspend or cancel service for "living or predominantly using Wireless Service outside of the AT&T owned and operated domestic network coverage area." If you'll spend most of the year in Mexico, ask AT&T which rule it applies to your line before you rely on it. If you'd rather not test those limits, how an eSIM compares with roaming lays out the other route.

When AT&T roaming isn't working in Mexico, check these settings first

Most problems clear with two steps from AT&T's travel advice: make sure data roaming is on, then turn the phone off and on again.

On iPhone, open Settings > Cellular, tap your AT&T number if you have two lines, then tap Cellular Data Options and turn on Data Roaming, as Apple's data roaming guide shows. On a Pixel, it's Settings > Network & internet > SIMs > Roaming. On a Galaxy, go to Settings > Connections > Mobile networks and turn on Data Roaming Access.

Still nothing? Check that airplane mode is off. Don't pick a Mexican network by hand either: AT&T's troubleshooting page says a manual network scan won't work in Mexico.

A new account can be the problem, too. AT&T's service agreement says it may block international roaming until you meet eligibility rules based on how long you've had service, your payment history or credit. If your line is new, ask AT&T before you go.

Pair a travel eSIM with your AT&T line when Mexico data runs slow or costly

Your AT&T Unlimited plan already covers Mexico, so for most vacations the simplest setup is the one you have. Three situations call for a travel eSIM: your plan leaves Mexico out and Day Pass would add $12 a day, your prepaid plan doesn't include Mexico, or you'd rather have data on a Mexican network than roaming that may slow to 2G.

As of November 8, 2026, HelloRoam's eSIM plans for Mexico are data only, and each one uses two local networks, Telcel and AT&T Mexico. Networks change from time to time, so the plan page has the current list. Driving back across the border? A North America plan gives you one eSIM for all three countries, the US, Canada and Mexico.

Check the lock before you buy anything. On iPhone, look under Settings > General > About: Apple says an unlocked phone shows "No SIM Restrictions" next to Carrier Lock. If it's SIM locked, AT&T's rules apply. On an AT&T Wireless plan, the phone must have been bought more than 60 days ago, be fully paid off and not reported lost or stolen, and sit on an account that isn't past due. Eligible Apple, Google and some Samsung phones on those plans should then unlock by themselves. Prepaid phones need 12 months of paid AT&T service, and the unlock is yours to request: in AT&T's Device Unlock app on Android, or with an online unlock request for an iPhone. A request can take up to 48 hours.

Before you buy, estimate your trip's data needs. Set up the eSIM before the flight while you're on home Wi-Fi. A Mexico plan's days don't start counting until it first connects in Mexico. A North America plan starts at its first connection in the US, Canada or Mexico, so keep that line turned off until you leave. On arrival, switch the eSIM line on, go to Settings > Cellular > Cellular Data and choose it, then turn on Data Roaming for that line. Make sure Allow Cellular Data Switching stays off. Per Apple, that switch lets the iPhone draw data from both lines, which on a Day Pass plan can start a $12 day.

Leave the AT&T line switched on as well, so your number still rings and bank codes still arrive. Apple notes your home line can still run up roaming fees. On an Unlimited plan, calls and texts in Mexico cost nothing extra. On a plan with Day Pass, answering a call or sending a text on the AT&T line starts a $12 day, though received texts don't.

Full disclosure: we sell travel eSIMs. If your Unlimited plan covers the trip and the odd slow patch doesn't bother you, keep using AT&T. Read our seller disclosure in the editorial policy.