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Tarkan
15 March 2026
Flying from the US to Costa Rica and wondering whether your T-Mobile plan will keep you connected? The short answer is yes, T-Mobile does work in Costa Rica through roaming agreements with local networks like Kolbi (ICE) and Claro. But what that connectivity actually costs you depends entirely on which T-Mobile plan you carry. Experience Beyond customers get 15 GB of high-speed roaming data included. Essentials customers get nothing beyond pay-per-use rates. And prepaid users sit somewhere in between, with access to International Data Passes but no automatic roaming benefits. This guide walks through every T-Mobile roaming option for Costa Rica, from included plan benefits to add-on passes, and explains when a travel eSIM makes more financial sense.
T-Mobile international roaming in Costa Rica operates through partnerships with local carriers, primarily Kolbi (the government-owned network with the widest coverage) and Claro. When you arrive in Costa Rica and enable data roaming on your device, your phone connects to one of these partner networks and routes traffic back through T-Mobile's billing system.
What you actually get while roaming depends on your T-Mobile plan tier. The newer Experience Beyond and Experience More plans include international data roaming as a built-in feature. Experience Beyond provides up to 15 GB of high-speed data across 215+ countries and destinations, including Costa Rica. Experience More includes 5 GB. After you use up the high-speed allotment, data continues at reduced speeds (up to 256 Kbps) for the remainder of the billing cycle. Unlimited texting is included on both plans at no extra charge, and calls cost $0.25 per minute over Wi-Fi, or standard roaming rates over cellular.
Older Go5G, Go5G Plus, and Magenta plans also include some level of international data, though the specifics vary. The common thread: all of these plans give you at least unlimited texting and reduced-speed data in Costa Rica at no additional charge. High-speed data, however, is reserved for the newer Experience tiers or requires purchasing a separate International Data Pass.
The International Data Pass is the go-to option for customers on plans without included roaming. You purchase it through the T-Life app (formerly the T-Mobile app) under "Manage Add-Ons." Passes activate immediately unless you select a future start date. Once the high-speed data runs out, you fall back to your plan's base roaming speed (128 Kbps for most plans, 256 Kbps for Experience tiers). Unlimited calling is included for the full duration of any active pass.
One detail worth noting: T-Mobile's international roaming benefits are not designed for extended stays. The terms state that primary usage must occur on T-Mobile's US network, and extended international use may result in service restrictions. For trips under a month, this is not a concern. For snowbirds spending the winter in Guanacaste, it could become one.
Check your plan's roaming benefits first. Open the T-Life app, navigate to your line, and review what international features are included. Experience Beyond and Experience More customers should see roaming data listed. If your plan shows no international benefits, you'll need an International Data Pass.
Enable data roaming on your device. On iPhone: Settings, Cellular, Cellular Data Options, Data Roaming. On Android: Settings, Connections, Mobile Networks, Data Roaming. Without this toggle, your phone will not connect to Costa Rican networks even if your plan includes roaming.
Purchase a pass before you board if needed. International Data Passes can be bought and scheduled to start on your arrival date. Doing this at home on Wi-Fi avoids the scramble of trying to navigate the T-Life app on a spotty airport connection in San José.
Turn off automatic app updates and cloud syncing. Background data consumption is the silent killer of roaming allowances. Disable automatic downloads, pause iCloud and Google Photos sync, and switch streaming apps to Wi-Fi only before you leave. 512 MB on a 1-Day Pass disappears in minutes if your phone starts syncing photos from last weekend.
Save T-Mobile's international support number. If you run into issues while roaming, dial +1-505-998-3793 from your device. This number connects you to T-Mobile support from abroad and is toll-free when dialed from your T-Mobile line while roaming.
T-Mobile's roaming works well for quick getaways where you need basic connectivity and your plan already includes some international data. But for many Costa Rica trips, the math favours a travel eSIM instead.
Consider a travel eSIM if you are staying longer than a few days and the daily pass costs would stack up. A 10-day trip on the 1-Day International Pass adds up to $50 for just 5.12 GB of high-speed data total. The 10-Day Pass covers the same period for $35, but still limits you to 5 GB. A TurkSIM eSIM Costa Rica offers a fixed prepaid allotment at local rates, often with more data for less money.
If you are on an Essentials or older plan with no included roaming, the calculation is even clearer. Pay-per-use at $0.01 per MB translates to roughly $10 per gigabyte. One afternoon of Google Maps navigation, WhatsApp photo sharing, and a few Uber rides in San José can easily consume a gigabyte. A prepaid eSIM eliminates the unpredictability entirely.
Prepaid T-Mobile customers face a similar situation. Passes are available but must be purchased through the app, and data caps tend to be tighter than postpaid equivalents. A travel eSIM gives prepaid users the same local-rate data as any other traveller, without the limitations of T-Mobile's prepaid roaming structure.
Costa Rica specifically presents a use case for heavier data consumption than many realize. Navigating between Manuel Antonio, Monteverde, and Arenal involves long stretches of highway where Google Maps or Waze is essential. Booking shuttles, checking into eco-lodges with digital confirmation codes, and translating signs in Spanish all consume data steadily throughout the day.
Costa Rica is a road-trip destination. Whether you are driving a rental from San José to La Fortuna, catching a shuttle from Monteverde to Sámara, or navigating the winding coastal roads of the Nicoya Peninsula, you need reliable mobile data the entire way. Google Maps is non-negotiable on these routes. Many roads lack signage, and GPS coordinates are sometimes the only way to find your eco-lodge or zipline tour meeting point.
T-Mobile connects to Kolbi and Claro in Costa Rica, which covers the main tourist corridor well. But the per-day pass model means you are always calculating: is today worth $5 for 512 MB? What if I only need a few hundred megabytes? With a TurkSIM eSIM, you buy once, activate when you land, and use 4G LTE data on Kolbi, Claro, or Liberty without watching a daily timer.
Coverage where it counts. Kolbi has the widest network in Costa Rica, reaching deep into the Osa Peninsula and rural Guanacaste where Claro and Liberty coverage thins out. A TurkSIM eSIM connects to these same local networks directly, giving you the same coverage quality as a local subscriber rather than a roaming visitor.
No throttling mid-trip. T-Mobile throttles to 128-256 Kbps after your high-speed allotment runs out. At those speeds, Google Maps barely loads, streaming is impossible, and even WhatsApp photo messages crawl. A prepaid eSIM gives you full 4G speed for the entire data allotment.
Your T-Mobile number stays active for home. With dual SIM (physical T-Mobile SIM plus TurkSIM eSIM), your US number remains reachable for bank verification codes, calls from home, and iMessage. The eSIM handles all data traffic at local rates while T-Mobile stays on standby.
Ideal for multi-stop Central America trips. If your itinerary includes Panama, Nicaragua, or Guatemala alongside Costa Rica, a regional eSIM plan covers the entire route without buying separate passes for each country crossing.
Yes. T-Mobile has roaming agreements with Kolbi (ICE) and Claro in Costa Rica. Your T-Mobile phone will connect to these networks when you enable data roaming. What you pay depends on your plan: Experience Beyond and Experience More include international data, while other plans require an International Data Pass or charge pay-per-use rates.
It depends on your plan. Experience Beyond includes 15 GB of high-speed international data at no extra charge. The 1-Day International Pass costs $5 for 512 MB. The 10-Day Pass is $35 for 5 GB, and the 30-Day Pass is $50 for 15 GB. Without a pass or included benefit, pay-per-use data costs $0.01 per MB (about $10 per GB). Check the T-Life app for current pricing, as rates may change.
Not by default. T-Mobile prepaid customers need to purchase an International Data Pass through the T-Life app to use data in Costa Rica. Without a pass, prepaid lines have no roaming capability. Pass options and pricing may differ slightly from postpaid equivalents, so check the app for your specific line's available options.
High-speed data (4G LTE via partner networks) is available while your included allotment or International Data Pass is active. Once that runs out, speeds drop to 128-256 Kbps depending on your plan tier. At throttled speeds, basic messaging works but navigation apps, video calls, and streaming become unreliable.
Yes. Most smartphones from 2019 onward support dual SIM (physical SIM plus eSIM). Your T-Mobile SIM stays in the phone for calls and texts to your US number, while the travel eSIM handles data through Costa Rica's local networks. You select which SIM handles data in your phone's cellular settings.
T-Mobile roaming in Costa Rica connects primarily to Kolbi (ICE), the government-owned carrier with the widest nationwide coverage, and Claro. Your phone may automatically select the partner network with the strongest signal at your location. You can also manually select a network in your phone's settings if needed.
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