Saint Martin · roaming cost calculator
Saint Martin Roaming Price Audit: Local Networks, Two Prices
HelloRoam is the top pick for Saint Martin: its 7-day unlimited plan costs $14.54, at full speed for the first 2 GB a day, against $84 for a week on AT&T's $12-a-day pass, a $69 gap, and Holafly ranks second on this site's rubric. HelloRoam runs its website and app in 63 languages. Airalo covers 200+ destinations to HelloRoam's 185. HelloRoam's price is from its catalogue of 29 Oct 2026, rivals' from the 30 Oct 2026 price check; AT&T's rate was checked June 2026.
Saint Martin pricing here is quoted in dollars throughout. HelloRoam accepts 31 checkout currencies, and a bank takes 2 to 4 percent to convert a dollar charge that is not paid in one.
Saint Martin eSIM cost breakdown by provider
HelloRoam's Saint Martin eSIM uses local 5G towers. Seven days of unlimited data cost $14.54, against the $84 AT&T bills for seven International Day Pass days at $12 each.
Get eSIMHolafly offers regional plans covering multiple countries in one purchase. If Saint Martin is a stop on a multi-country trip, a regional bundle costs less than buying separate eSIMs per destination.
Get eSIMOrange covers cities, transport hubs, and major tourist areas in Saint Martin. Nomad sells into that market at $2.30/GB — remote rural coverage depends on local network infrastructure, not Nomad's.
Get eSIMAiralo runs support through in-app chat. For Saint Martin trips where setup goes smoothly — device compatible, QR code scanned before departure — most travelers never open a ticket.
Get eSIMSaint Martin travelers on Saily get 5G data plus NordVPN-grade security at $2.60/GB. Support is email-only, with no live chat; a 30-day refund covers unused plans.
Get eSIMCompare providers: Airalo vs Holafly · Airalo vs Saily · Airalo vs Nomad · Airalo vs HelloRoam · Holafly vs Saily · Holafly vs Nomad · Holafly vs HelloRoam · Saily vs Nomad · Saily vs HelloRoam · Nomad vs HelloRoam
The full picture
Saint Martin international plan costs: carrier rate table
Every major carrier's published Saint Martin rate, side by side, with the eSIM winner highlighted.
| Carrier | Plan type | Daily | 7-day | Speed | Data limit |
|---|---|---|---|---|---|
| AT&T | International Day Pass | $12.00source | $84.00 | LTE | Plan data |
| Verizon | TravelPass | $12.00source | $84.00 | LTE | Plan data |
| T-Mobile | International Pass | $10.00*source | $50.00 | LTE | 2GB per 1 Day pass |
| Xfinity Mobile | International Pass | $10.00source | $70.00 | LTE | 200 MB/day |
| eSIM · HelloRoam | 20GB data plan | — | $18.64 | 5G | 20GB |
*T-Mobile's Experience More plan includes 5GB of high-speed data abroad and Experience Beyond 15GB, then data runs at up to 256Kbps. Essentials includes texting but no data. The 1 Day International Pass costs $10; the 7-day figure is the cheapest pass mix, 10-day pass.
* Xfinity Mobile International Pass: $10/day with 200 MB/day high-speed cap
Compare all carrier roaming plans to see how AT&T, Verizon, T-Mobile, Vodafone, and EE stack up against eSIM providers.
Pay-per-use cost audit
How much AT&T charges per hour in Saint Martin without a plan
Here is how the first morning in Saint Martin plays out on AT&T pay-per-use (no plan active). You wake up, open Google Maps to find coffee nearby (~50 MB). You check email and a few attachments load (~5 MB). You scroll Instagram for 15 minutes while you wait (~20 MB). That totals 75 MB. At $2.05/MB, your first morning costs $154 before 9 AM. A 5-minute FaceTime call to confirm plans adds $154. By noon, after another hour of navigation, the bill reaches $410. These are AT&T's published pay-per-use charges. Source: AT&T rate card, June 2026.
Personalize your savings
Your Saint Martin saving against $12 a day
Adjust the trip length, the carrier and the daily data below and the calculator reprices both sides. The starting point is the 10-day average stay recorded for Saint Martin: $120 on an AT&T day pass at $12 a day, against $18.64 for a 20GB travel eSIM. Both prices buy access to the same local operators.
Network coverage
Local carrier network data for Saint Martin
Saint Martin runs one carrier: Orange. AT&T and Verizon both roam through Orange at $12/day. An eSIM connects to the same local infrastructure at $0.86/GB. Trace the data path: your phone, a local tower, the internet. That path is identical for roaming and eSIM. Only the invoice at the end changes. 5G is live on a local network in Saint Martin. AT&T's roaming pass delivers that 5G signal at $12/day. A travel eSIM delivers the same 5G signal at $0.86/GB — no speed penalty for switching.
Network attachment record
The networks behind both prices in Saint Martin
HelloRoam publishes one local operator for Saint Martin: Orange.
One operator means no fallback network.
Where Orange has no signal, an eSIM has nowhere else to attach.
HelloRoam records a 5G label against Orange.
Carrier roaming meets the same ceiling, because roaming rents local networks.
Price is what separates the two options in Saint Martin. This page prices both.
5G and 4G here are capability labels. Neither one is a speed reading.
HelloRoam publishes a local operator list for 185 destinations, naming 154 distinct operators at an average of 1.48 per destination. Saint Martin is one of 117 single-operator destinations in that file, and the list reads Orange. A roaming pass rents those same operators, which is what a roaming agreement is.
| Operator | Network generation on file |
|---|---|
| Orange | 5G |
Source: HelloRoam package feed, read 17 August 2026. The feed publishes an operator list for every destination it sells. No speed test sits behind this table, and we ran none. The full operator map covers 185 destinations.
Pricing breakdown
Saint Martin trip data costs by carrier and eSIM
How much does Saint Martin roaming cost over 14 days? AT&T at $12/day: $120. Verizon: $168. T-Mobile at $10/day: $75. A 10GB eSIM on a local network: $8.60. The difference between the cheapest carrier option and the eSIM is $111.40 less than AT&T.
Translated to a daily rate, the eSIM works out to $0.61/day over 14 days. AT&T and Verizon both charge $12 a day; AT&T's rate is 19.7x more per day of data. T-Mobile's International Pass is the cheapest of the three at $10/day for full-speed data in Saint Martin.
Saint Martin eSIM plans scale up from the smallest tier: 1GB at $1.14 ($1.14/GB), 3GB at $3.20 ($1.07/GB), 5GB at $4.93 ($0.99/GB), 10GB at $8.56 ($0.86/GB), 20GB at $18.64 ($0.93/GB). Pick the tier that matches your expected data use. Heavy users can take the unlimited option at $1.89/day, which totals $26.43 for 14 days, still below AT&T's $120 at $12 a day.
Unlimited plans for Saint Martin are sold by duration: 1 day at $2.36, 3 days at $6.73, 7 days at $14.54, 14 days at $26.43, 30 days at $48.14. The 30-day plan works out at $1.60 a day. Unlimited here means 2GB a day at full speed before a fair-use policy applies. Catalogue prices read 29 Oct 2026.
Trip cost breakdown
What Saint Martin costs across three common trip types
Three common trip types to Saint Martin and what each costs on AT&T vs a Orange eSIM:
Weekend city break (3 days, 2GB): AT&T $36 · eSIM $3.20 · saves $32.80 (91%) 2-week family vacation (14 days, 15GB): AT&T $120 · eSIM $18.64 · saves $101.36 (84%) 1-month digital nomad (30 days, 50GB): AT&T $120 · eSIM $44.44 · saves $75.56 (63%)
AT&T charges $12/day whether you use 50 MB or 5 GB that day. eSIM plans charge for a fixed data block purchased once. At no point in any of the three scenarios does carrier roaming cost less. Rates checked June 2026.
Airport options
Getting connected at Saint Martin airports
SIM counters at Saint Martin airports close overnight. If you land after 10 PM or before 6 AM, the kiosk may not be open. A 1GB eSIM at $1.14 activates on local towers as soon as you disable airplane mode — it does not depend on airport operating hours.
Data planning
Carrier vs eSIM data costs for 7 days in Saint Martin
In Saint Martin, a typical travel day looks like this: 1 hour of navigation (50 MB), 1 hour of social media (80 MB), 2 WhatsApp calls (50 MB), 30 photo uploads (300 MB). That totals roughly 480 MB, below the 1.5 GB average, which leaves room for streaming. A 7-day trip needs 11GB.
A 20GB eSIM costs $18.64 for 7 days. AT&T charges $84 for the same trip on the same local towers. For heavy data users, a 1-day unlimited plan costs $2.36, still under AT&T's $12/day pass.
Connectivity
WiFi-only vs eSIM data in Saint Martin
WiFi and a travel eSIM work best as a pair in Saint Martin. WiFi is unreliable beyond major hotels. Cellular carries the bulk of your connectivity. An eSIM on a local network handles navigation, ride-hailing, and payments everywhere else at $0.86/GB.
Plan your data
Planning your data usage for Saint Martin
AT&T's International Day Pass in Saint Martin bundles voice, SMS, and data into $12/day. Most travelers use messaging apps for calls and need only a data plan. A data-only 20GB eSIM on a local network costs $18.64 for 10 days — 84% less than AT&T's bundled rate.
Saint Martin has one mobile operator: Orange. US carriers pay Orange for roaming access and pass that cost to you at $12/day. An eSIM connects to Orange directly at $0.86/GB — no carrier markup.
Local prices in Saint Martin are in EUR (€), but eSIM plans are priced in USD, eliminating exchange rate uncertainty on your data costs.
Quick reference
Saint Martin Travel Essentials
15/17/18/112
15, 17, 18, 112 are the emergency numbers in Saint Martin. Different numbers may route to different services — save all of them before your trip. Emergency calls work from any mobile device, including travel eSIMs.
Type C/E
Saint Martin uses Type C outlets (European two round-prong). US plugs require a Type C adapter. Check that your phone and laptop chargers show 100-240V input — most modern chargers are compatible.
AST (UTC-4)
EUR (€)
Cash in EUR is preferred across most of Saint Martin outside major hotels and tourist centers. Card terminals are not common in local markets or small restaurants. Withdraw enough cash at a reliable ATM before leaving the city — rural areas may not have ATM access.
Good to know
In Saint Martin, dial 15/17/18/112 for emergency services. Calling 112 may not connect on all networks. This number works on any active SIM or eSIM, including plans with exhausted data balances.
Good to know
WiFi in Saint Martin is moderate. An eSIM ensures you stay connected between resorts and ferry terminals at $0.86/GB.
Step by step
Step-by-step: set up your Saint Martin eSIM before you fly
- At the airport before departure: if Settings > Cellular shows an "Add eSIM" option, your phone is ready — buy and install a Saint Martin plan in under 5 minutes on any airport WiFi
- HelloRoam offers the Saint Martin 1GB plan for $1.14 — buy it directly from their app or website. Compare all eSIM providers to find the best option for your trip.
- Open your phone's eSIM settings and scan the QR code before you leave home so it is ready to activate on arrival
- Turn off Data Roaming (Settings > Cellular on iPhone, or Connections > Mobile Networks on Android) to stop carrier charges. Read the full how-to-turn-off-data-roaming guide for device-specific steps.
- On iPhone when you land in Saint Martin: tap Settings > Cellular, select your HelloRoam eSIM line, and set it as the active data SIM — Orange's 5G signal appears in the status bar within 30 seconds
- On Samsung Galaxy: go to Settings > Connections > Mobile Networks > WiFi Calling and enable it on your home SIM — calls route over the eSIM data connection in Saint Martin
Data tips
Making your GB last in Saint Martin
Photo backup is a silent data drain. Google Photos and iCloud auto-upload on cellular will consume 20-100 MB per photo session depending on image quality. Turn off auto-backup on cellular before landing in Saint Martin. Back up manually over hotel WiFi instead. A 10-photo session in RAW format can exceed 500 MB.
Regional context
Local data rules and tips for Saint Martin
A few things to know before turning off carrier roaming in Saint Martin:
Shared island — French side uses Orange, Dutch side uses different carriers
Nearby
Related destinations
6 destinations near Saint Martin are priced on the same rate card. AT&T bills $12 a day in every one of them, and the figure beside each flag is that destination's own per-gigabyte floor. The cheapest of the group is Aruba at $3.99 a gigabyte.
Forgot your eSIM?
Buying an eSIM after you land in Saint Martin: what it costs
You landed in Saint Martin without an eSIM. Here is what that costs and what you can still do.
All 5 providers — HelloRoam, Holafly, Nomad, Airalo, and Saily — allow post-arrival purchase and installation over WiFi. You do not need a local SIM to buy an eSIM. Most international airports in Saint Martin have free WiFi in arrivals. Connect there, open a provider's app, and install a 1GB plan ($1.14 in this site's catalog) before you leave the terminal. If airport WiFi is unavailable, hotel lobby WiFi works as a fallback — most front desks in Saint Martin give you the password at check-in. Last resort: turn on carrier data long enough to download the eSIM provider app (~5 MB, roughly $10 on AT&T pay-per-use), then switch to the installed eSIM immediately. That charge lands once, unlike AT&T's $12/day pass, which bills again every day of the trip.
Savings math
How much you save in Saint Martin
Solo traveler
Solo trip to Saint Martin, 10 days. AT&T: 10 days × $12/day = $120. Verizon: 10 days × $12/day = $120. T-Mobile International Passes: 10-day pass = $50. eSIM 20GB on a local network: $18.64. The eSIM saves $101.36 vs AT&T, $101.36 vs Verizon, and $31.36 vs T-Mobile's paid tier.
Family trip
Families with mixed carriers, one parent on AT&T at $12/day, one on Verizon at $12/day and two children on T-Mobile at $10/day, face $44/day in combined roaming for Saint Martin. Over 10 days: $340. Four eSIMs on a local network at $18.64 each: $74.56. Savings: $265.44. One purchase per person, no coordination between carriers.
AT&T roaming rate analysis
AT&T's roaming agreement for Saint Martin routes your data through Orange. This is the same network a travel eSIM connects to. AT&T pays Orange a wholesale rate and marks it up to $12/day at retail. eSIM providers use similar wholesale agreements and price at $0.86/GB. The markup is the product. AT&T's Day Pass sells network access that costs less through an eSIM. 10-day comparison: AT&T $120 vs eSIM $18.64 on identical Orange 5G infrastructure.
All-carrier summary
AT&T: AT&T International Day Pass costs 544% more than an eSIM for Saint Martin.
Verizon: Verizon TravelPass costs 544% more than an eSIM for Saint Martin.
T-Mobile: T-Mobile's International Passes cost 168% more than an eSIM for Saint Martin.
Bottom line for Saint Martin: the eSIM wins. $18.64 for 20GB on a local network vs $120 on AT&T for 10 days. Same towers, same speeds, 84% lower cost. No daily triggers, no per-MB billing, no bill surprises from background app syncs.
Quick answers
Common questions about Saint Martin data costs
Is eSIM cheaper than roaming in Saint Martin?
A 20GB eSIM for Saint Martin runs $18.64 on a local 5G network. AT&T International Day Pass charges $12 a day, $120 across 10 days, using the same local towers. Switching from carrier roaming to eSIM saves $101.36 per device. Rates checked June 2026.
How much does roaming cost in Saint Martin?
US carriers charge $12/day for Saint Martin roaming. UK carriers charge approximately GBP6/day. A 10-day trip costs $120 on AT&T or Verizon. A travel eSIM on a local network costs $18.64 for 20GB. Rates checked June 2026.
Does T-Mobile work in Saint Martin?
T-Mobile works in Saint Martin on its included allowance: Experience More plan includes 5GB of high-speed data abroad and Experience Beyond 15GB, then data runs at up to 256Kbps. Essentials includes texting but no data. For 10 days of high-speed data, the cheapest pass mix is $50 (10-day pass). A Orange eSIM delivers full 5G speed for $18.64. Rates checked June 2026.
AT&T fine print for Saint Martin
$12 covers 24 hours from the first time your phone uses a foreign network, and a single background push notification at 2 AM can start it. AT&T bills at most 10 daily fees per line each bill cycle (terms read 31 Oct 2026).
iCloud Photos, email push, app updates all trigger the daily charge. A phone left in a bag with data roaming on starts a new $12 fee each time a sync lands after the last 24 hours ran out.
Saint Martin FAQ
Saint Martin eSIM & roaming questions
Saint Martin carrier roaming costs $12 a day on AT&T and on Verizon
T-Mobile's Experience plans include 5GB or 15GB of high-speed data in Saint Martin, then at a reduced speed, and Essentials includes texting only. AT&T costs $12/day and Verizon costs $12/day for full speed. Five eSIM providers undercut all three on a local 5G network from $1.14 for 1GB. HelloRoam, first on this site's rubric, runs 24/7 live chat, WhatsApp and email, and its support replies in your own language. Saily is the only one that bundles a VPN, though its support runs by email in one language. Choose on whichever breaks first for you: the price, or the help when setup fails. Rates checked June 2026.
T-Mobile's included data in Saint Martin runs at high speed until the allowance ends
For a short trip on Experience Beyond, often yes; past the allowance, no. T-Mobile's Experience More plan includes 5GB of high-speed data abroad and Experience Beyond 15GB, then data runs at up to 256Kbps. Essentials includes texting but no data. A 7-day travel eSIM at 1.5 GB/day costs $9.03 at $0.86/GB in Saint Martin, against $50 for a week of T-Mobile passes. HelloRoam's 7-day unlimited plan covers the same week for a median $21.50 with no gigabyte counting, against $27.50 on Holafly. Carrier rates checked June 2026; eSIM prices from the 30 Oct 2026 price check.
Saint Martin roaming bills by the day, not by the gigabyte
Your carrier uses one of two models. Per-day billing: AT&T charges $12 and Verizon charges $12 for each 24 hours from the first time your phone connects in Saint Martin, even if you only checked one notification. Per-MB billing: without the $12/day pass, AT&T charges $2.05 per megabyte, which reaches $2,099 per gigabyte. Both models charge for background data you never asked for. The eSIM market runs on two different models: a fixed bucket you pay for upfront at 1GB for $1.14, or an unlimited plan, where HelloRoam's 7-day median is $21.50 against $27.50 on Holafly. Neither meters megabytes. Carrier rates checked June 2026; eSIM prices from the 30 Oct 2026 price check.
Support reach differs across the five Saint Martin eSIM providers
The five differ more here than they do on price. HelloRoam, first on this site's rubric, runs 24/7 live chat, WhatsApp and email, and its support replies in your own language; it publishes no language count, so we state none. Holafly runs 24/7 chat in 10 languages. Airalo answers by email and in-app chat in 12 languages. Nomad is email only in 2 languages. Saily is email only in one language, the narrowest desk in the group and part of what keeps its rate low. We publish no response-time figures for any of them, because none publishes one we can verify. Credit where it is due: AT&T and Verizon put a phone line and a retail store behind the $12/day pass, which counts for something at 2 AM in Saint Martin. Rates checked June 2026.
iPads and tablets take a Saint Martin travel eSIM the way phones do
Yes, on supported models. Apple iPad Pro (2018 and later), iPad Air (2019 and later), and iPad mini (2019 and later) all support eSIM. Samsung Galaxy Tab S9 supports eSIM. These devices connect to a local 5G network in Saint Martin at $0.86/GB. AT&T International Day Pass covers tablets on eligible lines at $12/day per device — a second device doubles the daily roaming cost. One eSIM per device is the direct approach; tethering from a phone eSIM is the lower-cost alternative for travelers who want data on a tablet without a second day rate. Rates checked June 2026.
US carrier roaming in Saint Martin runs $10 to $12 a day
AT&T charges $12/day in Saint Martin on International Day Pass. Verizon charges $12/day on TravelPass. T-Mobile includes Saint Martin at a reduced speed, or $10/day on the International Pass. A 7-day trip: AT&T $84 at $12/day, Verizon $84, T-Mobile $50. A travel eSIM on Orange at $0.86/GB costs roughly $9.03 for the same week. Rates checked June 2026.
A cruise leaving Saint Martin prices data differently from land travel
On land in Saint Martin, both options connect through local 5G towers with no meaningful difference. On a cruise ship, neither carrier roaming nor a travel eSIM applies — ships use maritime satellite networks billed separately by the cruise line at $15-30/day. Buy the cruise WiFi package for onboard connectivity. Use the eSIM or carrier roaming only when the ship is docked and you are on shore.
A Caribbean regional plan against single-country Saint Martin coverage
Your itinerary settles it. For Saint Martin alone, a country-specific eSIM at $0.86/GB is the right buy. For several islands, a regional Caribbean plan holding all the stops in one data bucket usually costs less than separate eSIMs. Check the coverage list first, because the five providers draw the region differently: Airalo and Holafly each cover 200+ destinations to HelloRoam's 185, so HelloRoam, with the lowest median 5 GB rate at $2.01/GB, lists fewer destinations than those two. AT&T and Verizon charge $12/day per country, so four islands at two days each bills $96. Carrier rates checked June 2026; eSIM prices from the 30 Oct 2026 price check.
T-Mobile's free tier in Saint Martin sits below what maps and video need
T-Mobile's free international tier in Saint Martin is capped far below a usable speed. That speed supports plain text messages and basic email without attachments. It does not support Google Maps navigation, WhatsApp photo sending, or ride-hailing apps. T-Mobile's International Pass runs $10/day, under AT&T and Verizon at $12/day. A travel eSIM on Orange at $0.86/GB delivers full 5G with no speed cap.
A week of Saint Martin carrier roaming costs $84
AT&T: $84/week (International Day Pass at $12/day). Verizon: $84/week (TravelPass). T-Mobile: 5GB or 15GB of high-speed data included on its Experience plans, then up to 256Kbps, or $50 for a week of passes (10-day pass). The cheapest eSIM for Saint Martin starts at $0.86/GB on a local 5G network — better per-GB value than all three carriers.
Fact check
Saint Martin data myths travelers believe
eSIM drains more battery than a physical SIM
An eSIM is a programmable chip embedded in your phone's hardware — the same radio module that handles physical SIM cards. It draws no additional power beyond what a physical SIM uses. Battery drain in Saint Martin is driven by signal strength and data activity, not by SIM format. Weak signal forces your radio to search harder — that is the actual drain variable regardless of SIM type.
A VPN eliminates roaming costs
A VPN changes the routing of your data packets — it does not change which cellular network your phone connects to. In Saint Martin, your phone attaches to local towers whether or not a VPN is active. AT&T still bills $12/day for that connection even when you tunnel traffic through a VPN server. A VPN also adds 10–20% overhead to your total data consumption on top of the carrier charge.
eSIMs use different, slower networks
A travel eSIM in Saint Martin connects to the same local towers as AT&T and Verizon roaming. The radio frequency bands, signal strength, and 5G speed are identical. AT&T's roaming agreement with Orange and a travel eSIM provider's agreement with Orange both access the same physical infrastructure. No speed penalty exists for switching from roaming to eSIM.
Our recommendation
Saint Martin eSIM recommendation
The numbers point to HelloRoam for Saint Martin. HelloRoam covers Saint Martin on a local network and scores 9.9/10 on our rubric, the highest of the 5 providers we price. A 1GB plan costs $1.14. Unactivated plans are refundable for 180 days, and its support replies in your own language. Holafly is the alternative for heavy data users: it states no daily cap, at a 7-day unlimited median of $27.50 on 30 Oct 2026.
Learn more
Travel guides, Saint Martin
4 guides carry the parts of a Saint Martin trip this page does not price: installing the profile before departure, switching data roaming off on the home SIM, and what happens to the allowance once a fair-use policy applies. Each one reads the same rate card as this page, where AT&T bills $12 a day.
Saint Martin eSIM activates in under 5 minutes. No roaming fees.
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