A Marnet travel eSIM for Saint Martin starts at $6.00 for 1 GB over 7 days. The product page lists the speed as 4G. Plans run from 7 to 30 days, and unlimited plans are listed separately from $12.50 for 3 days. Coverage is the French part of the island.
Key facts
| Country | Saint Martin |
| Network | Marnet |
| Speed | 4G (published on the product page; subject to carrier Fair Usage Policy) |
| From | $6.00 for 1 GB / 7 days |
| Validity | 7, 15, or 30 days |
| Install | QR code, before you fly |
What a Marnet eSIM costs
The cheapest published plan on the Saint Martin travel eSIM is $6.00 for 1 GB valid 7 days. A 2 GB / 15 day plan is $8.55, a 3 GB / 30 day plan is $10.80, and a 5 GB / 30 day plan is $17.10. The 3 GB / 30 day plan is the value pick: a full month for $4.80 more than the 7 day plan and three times the data. The step from 3 GB to 5 GB costs $6.30 for two extra gigabytes, which is the weakest step on the product, so buy 5 GB only if you know you will use it.
Network
The plan is sold under the operator name Marnet and the supported country is Saint Martin, the French part of the island. That distinction is the one thing to get right here. The island is split between French Saint-Martin in the north, with Marigot as its capital, and Dutch Sint Maarten in the south, with Philipsburg and the cruise port. This plan covers the French collectivity only, so treat the border at Bellevue as the edge of your coverage: crossing to Philipsburg, Maho, or Simpson Bay may leave you without data. Saint Martin is a French overseas collectivity and is not part of the European Union’s territory, so a French or European SIM’s home roaming does not automatically extend to it. The product page publishes the speed as 4G, and real speed still depends on the mast, the handset, and the carrier Fair Usage Policy.
How much data you actually need
Maps, chat, and restaurant bookings sit inside 1 GB for a short stay. The French side is compact, and hotel and beach club Wi-Fi is widely available in Marigot, Grand Case, and Orient Bay, so a small bucket goes a long way if you stay on that side. If you plan to spend days in Philipsburg or around Simpson Bay, buy a separate plan for the Dutch side rather than gambling on cross-border signal. A week of daily uploads is the 3 GB plan, and 5 GB covers a longer stay or hotspotting.
Unlimited data
Unlimited plans are listed on the same product page, from $12.50 for 3 days, $17.43 for 5 days, $23.38 for 7 days, $29.75 for 10 days and $49.00 for 15 days. Compare them against the buckets before buying: 5 GB over 30 days costs $17.10, which is less than 5 days of unlimited at $17.43, and 3 GB over 30 days at $10.80 is cheaper than 3 days of unlimited at $12.50. Unlimited still sits under a Fair Usage Policy, so a hotspot left running all day is exactly what gets slowed.
Dual SIM
Keep your home SIM for calls and bank texts. Turn on data roaming only for the Marnet line. iPhone: Settings, Mobile Data, pick the travel line. Android: Settings, Network, SIMs, set mobile data to the travel eSIM. Do this before you leave the airport Wi-Fi.
Arrival and transit
Flights arrive either at Princess Juliana International (SXM) on the Dutch side, which takes the long-haul traffic, or at L’Espérance (SFG) near Grand Case on the French side for regional hops. Ferries link Marigot and Gustavia for day trips to Saint Barthélemy, and that island needs its own plan. Install the eSIM on hotel or home Wi-Fi before the flight, then switch the data line on after you clear arrivals. You do not need a local shop or a passport photo for this plan.
Install
- Buy the plan and open the QR code in the order email while you still have Wi-Fi.
- On the phone, add an eSIM and scan that code. Label the line “Saint Martin”.
- After landing, set mobile data to that line and leave your home number on for texts.
Phone compatibility
The phone must be carrier-unlocked and eSIM-capable. iPhone XS and later, and recent Samsung Galaxy and Google Pixel models, qualify. A locked handset will not take the QR code. Check the lock status with your home carrier before you pay.
FAQ
Q1: How much is the cheapest Saint Martin eSIM?
$6.00 for 1 GB, valid 7 days, on the Marnet plan.
Q2: Which operator is on the plan?
Marnet. The supported country is Saint Martin, the French part of the island.
Q3: Does it include calls and SMS?
No. It is a data plan, with voice calls only through apps such as WhatsApp or FaceTime. Keep your home SIM for calls and one-time passwords.
Q4: Is it 5G?
No. The product page lists the speed as 4G. Real speed still depends on coverage and the Fair Usage Policy.
Q5: Can I install it after I land?
Yes, if you can reach Wi-Fi. Installing before the flight is simpler, because the QR download needs a connection.
Q6: Will it work on the Dutch side of the island?
No. This plan covers the French collectivity of Saint Martin only. Sint Maarten, Philipsburg, and Maho need their own plan.
Q7: Is there an unlimited option?
Yes. Unlimited plans are listed separately on the same product page, from $12.50 for 3 days.
Q8: Can I share it as a hotspot?
Yes, within the data allowance. Hotspot traffic counts against the same gigabytes, and heavy sharing can hit the Fair Usage Policy.
Q9: What if the QR code fails?
Use the manual activation code in the same email. The phone still has to be unlocked.
Q10: When were these prices checked?
October 2026, against the published variation prices on travelydata.com.
Bottom line
For a week on the French side, the $6.00 / 1 GB Marnet plan is the entry point, and the 3 GB / 30 day plan at $10.80 is the one most travellers should buy. Take 5 GB at $17.10 for a longer stay or heavier uploads, and remember that the Dutch half of the island is outside this plan’s coverage. The published speed is 4G, and the buckets are better value than unlimited here.
Prices and coverage verified on travelydata.com, October 2026.
