Cost Comparison
Saint Barthelemy: Roaming Charges vs eSIM Prices, Carrier by Carrier (2026)
Carrier roaming in Saint Barthelemy costs $10-$15/day across 4 carriers. A travel eSIM on Orange's network costs $2.17/GB. Both access the same 5G towers. The price gap is 2.3x.
Roaming costs by carrier
AT&T in Saint Barthelemy
Plan
International Day Pass
Daily rate
$10/day
7-day cost
$70
14-day cost
$140
AT&T's day pass in Saint Barthelemy activates the moment your phone connects to Orange's network abroad — including the two minutes of background data sync when you land. A full $10 charge runs whether you use 10MB or 10GB that day.
Verizon in Saint Barthelemy
Plan
TravelPass
Daily rate
$10/day
7-day cost
$70
14-day cost
$140
Verizon pays Orange for roaming access in Saint Barthelemy and charges you $10/day. A travel eSIM bypasses that arrangement at $2.17/GB on the same Orange towers.
T-Mobile in Saint Barthelemy
Plan
Magenta (high-speed add-on)
Daily rate
$15/day
7-day cost
$105
14-day cost
$210
T-Mobile routes through Orange in Saint Barthelemy at $15/day — the same network a $2.17/GB eSIM uses.
Xfinity Mobile in Saint Barthelemy
Plan
International Pass
Daily rate
$10/day
7-day cost
$70
14-day cost
$140
In Saint Barthelemy, Xfinity Mobile connects to Orange towers at $10/day. An eSIM reaches the same towers from $2.17/GB.
eSIM costs by provider
Metered plans (1GB-20GB)
| Tier | Price | Per GB |
|---|---|---|
| 1GB | $5.70 | $5.70 |
| 3GB | $16 | $5.33 |
| 5GB | $22.66 | $4.53 |
| 10GB | $32.56 | $3.26 |
| 20GB | $43.34 | $2.17 |
Unlimited daily plans
| Days | Price | Per Day | Discount |
|---|---|---|---|
| 1 days | $5.65 | $5.65 | 4% |
| 3 days | $16.26 | $5.42 | 8% |
| 7 days | $37.93 | $5.42 | 8% |
| 14 days | $73.39 | $5.24 | 11% |
| 30 days | $144.89 | $4.83 | 18% |
Network access
eSIM plans in Saint Barthelemy connect to Orange's 5G network — the same towers that carrier roaming uses. Orange is the sole operator, so both roaming and eSIM deliver identical coverage.
Side-by-side comparison
7-day trip comparison
| Option | Cost | Data | Speed | Network |
|---|---|---|---|---|
| AT&T | $70 | Plan data | LTE | Orange |
| Verizon | $70 | Plan data | LTE | Orange |
| T-Mobile | $105 | Throttled | 256kbps* | Orange |
| Xfinity Mobile | $70 | 200 MB/day | LTE | Orange |
| eSIM (20GB) | $43.34 | 20GB | 5G | Orange |
| eSIM (Unlimited) | $41.23 | Unlimited | 5G | Orange |
14-day trip comparison
| Option | Cost | Data | Speed | Network |
|---|---|---|---|---|
| AT&T | $140 | Plan data | LTE | Orange |
| Verizon | $140 | Plan data | LTE | Orange |
| T-Mobile | $210 | Throttled | 256kbps* | Orange |
| Xfinity Mobile | $140 | 200 MB/day | LTE | Orange |
| eSIM (20GB) | $43.34 | 20GB | 5G | Orange |
| eSIM (Unlimited) | $82.46 | Unlimited | 5G | Orange |
Per-day rate breakdown
AT&T charges $10/day. A 20GB eSIM spread across 10 days costs $4.33/day — 2.3x cheaper on the same Orange 5G network.
Hidden charges
Auto-enrollment and day-one billing
AT&T and Verizon roaming passes activate automatically when your phone connects to Orange's network in Saint Barthelemy. Calendar-day billing means arriving at 11:30 PM and leaving before midnight the next day counts as two full day charges. A single background app refresh on landing triggers the first charge.
Speed throttling and data caps
T-Mobile's free international data runs at 256 Kbps — too slow for Google Maps, Instagram, or video calls. Xfinity Mobile caps high-speed data at 200 MB per day before throttling. AT&T and Verizon do not publish their throttling thresholds, but users report speed reductions on sustained high-bandwidth use.
Voicemail and background app charges
Checking voicemail abroad is treated as an inbound international call. If the day pass has not yet activated, that single voicemail retrieval triggers the full daily charge. Background app sync, push notifications, and automatic app updates all count toward data usage and can activate the daily pass without your knowledge.
Carrier rate analysis for Saint Barthelemy
AT&T International Day Pass
AT&T's roaming agreement for Saint Barthelemy 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 $10/day at retail. eSIM providers use similar wholesale agreements and price at $2.17/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 $100 vs eSIM $43.34 on identical Orange 5G infrastructure.
Verizon TravelPass
Verizon TravelPass and AT&T International Day Pass both charge $10/day in Saint Barthelemy. Both route through Orange's 5G towers. Neither carrier offers a lower rate for this destination. The only variable is billing mechanics: Verizon resets at midnight local time, AT&T resets at midnight EST. Both trigger from background data. A 20GB eSIM at $43.34 eliminates per-day billing entirely. 10-day savings vs either carrier: $56.66.
T-Mobile International
T-Mobile's paid high-speed add-on for Saint Barthelemy: $15/day. 7 days: $105. 10 days: $150. This rate exceeds AT&T ($10/day) and matches Verizon ($10/day). T-Mobile customers who need real data speeds in Saint Barthelemy pay more per day than AT&T customers do. A 20GB eSIM at $43.34 costs less than all three paid tiers on the same Orange 5G network.
Vodafone Roaming Passport
Vodafone applies a fair-use data cap to roaming in Saint Barthelemy. The threshold is not prominently published. Once exceeded, speeds drop while the GBP6/day charge continues. A traveler who streams video or joins video calls may hit the cap within 2-3 days. A 20GB eSIM at $43.34 states its data ceiling upfront. Speed remains at full 5G until the plan is consumed. No hidden threshold, no surprise throttle mid-trip.
EE Roam Abroad
EE does not require manual roaming activation for Saint Barthelemy. Your phone connects to Orange the moment the plane lands. The GBP6/day charge applies from that first connection. To avoid: switch to airplane mode before landing. Activate the travel eSIM from the provider app. Set the eSIM as the primary data SIM. Only then disable airplane mode — the EE SIM stays active for calls while the eSIM at $43.34 handles all data on Orange.
Xfinity Mobile International Pass
Xfinity Mobile International Pass for Saint Barthelemy: $10/day with a 200 MB daily high-speed cap. After 200 MB, data throttles to 2G-equivalent speeds for the rest of the calendar day. 200 MB covers roughly 4 hours of Google Maps navigation or 15 minutes of video calling. Most travelers exceed 200 MB before lunch. Over 10 days: $100 total, with throttled speeds most of each day. A 20GB eSIM at $43.34 provides the full data allocation at 5G with no daily cap.
Three UK Go Roam
Three UK Pay As You Go customers face different international rates than contract customers. PAYG roaming in Saint Barthelemy uses per-MB billing at rates that can exceed £1/MB. A 50 MB Google Maps session costs £50 on PAYG. Three contract customers: £5/day. eSIM on Orange: $43.34 for 20GB. Three PAYG customers must buy a travel eSIM before departure.
MVNO roaming comparison
Boost Mobile's international options for Saint Barthelemy are limited to add-on packs that provide small data allotments (typically 100-500 MB) at $5-$10 per pack. A 500 MB Boost pack runs out in under 2 hours of normal smartphone use. A 20GB eSIM at $43.34 on Orange provides 40x more data than a Boost international pack. Boost customers should install a travel eSIM before departure.
Rate summary
AT&T (International Day Pass): AT&T International Day Pass costs 131% more than an eSIM for Saint Barthelemy.
Verizon (TravelPass): Verizon TravelPass costs 131% more than an eSIM for Saint Barthelemy.
T-Mobile (Magenta (high-speed add-on)): T-Mobile's paid high-speed tier costs more than AT&T and more than an eSIM.
Bill shock scenarios
Scenario: you need an Uber from the international airport to your hotel in Saint Barthelemy. The Uber app uses 5-10 MB to load, request a ride, and track the driver. On AT&T pay-per-use: $15.37 for one ride request. Google Maps navigation to verify the route: $46.12 for 15 minutes. Total for one airport transfer: $61.5. AT&T Day Pass: $10 covers unlimited rides for the day. eSIM on Orange: $43.34 covers 10 days of rides.
How to switch to an eSIM
Switching from Vodafone or EE to an eSIM for Saint Barthelemy: Step 1: Check if Saint Barthelemy is in the EU roaming zone. If yes and you are on Vodafone/EE Pay Monthly, roaming may be free and an eSIM is unnecessary. Step 2: For non-EU Saint Barthelemy: disable data roaming to prevent Vodafone's £6/day Roaming Passport or EE's £6/day Roam Abroad. Step 3: Install a 20GB eSIM at $43.34 on Orange. Step 4: Set the eSIM as default data. Keep your UK SIM for calls and texts. WiFi Calling on Vodafone and EE routes your UK number through the eSIM's data for free.
Is eSIM cheaper than roaming in Saint Barthelemy?
A 20GB eSIM for Saint Barthelemy runs $43.34 on Orange's 5G network. AT&T International Day Pass charges $100 for 10 days using the same Orange towers. Switching from carrier roaming to eSIM saves $56.66 per device. Rates verified May 2026.
Should I use eSIM or roaming in Saint Barthelemy?
An eSIM avoids the hidden costs of roaming in Saint Barthelemy. Carrier roaming charges $10 per calendar day, triggered by background data sync the moment you land. An eSIM charges $43.34 flat for 20GB over 10 days on Orange. No per-day billing traps. Verified May 2026.
Does T-Mobile work in Saint Barthelemy?
T-Mobile provides free data in Saint Barthelemy, but at 256 Kbps. That speed cannot load Google Maps, use ride-hailing apps, or stream audio. T-Mobile's high-speed International Pass costs $5-15/day. A travel eSIM on Orange's 5G network costs $43.34 for 20GB over 10 days. Verified May 2026.
What is the best way to get data in Saint Barthelemy?
Use a travel eSIM with dual-SIM to keep your home number active in Saint Barthelemy. The eSIM handles data on Orange's 5G network for $43.34. Your primary SIM stays connected for calls and texts. Carrier roaming charges $100 for the same setup. Verified May 2026.
Our verdict for Saint Barthelemy
When carrier roaming makes sense
Carrier roaming makes sense for 1-day layovers where the $10 charge is less than the effort of installing an eSIM. Travelers who need voice calling to local Saint Barthelemy numbers may also prefer their carrier plan, since eSIM data plans do not include voice service.
When an eSIM wins
For any trip longer than 2 days, an eSIM saves money over carrier roaming in Saint Barthelemy. Families and groups save even more because carrier charges multiply per person. Countries with airport SIM queues make eSIM especially valuable — install before departure, activate on landing.
Bottom line for Saint Barthelemy
For a 10-day trip to Saint Barthelemy, an eSIM saves $56.66 vs AT&T and delivers the same 5G connection on Orange's network.
Saint Barthelemy connectivity details
Local network infrastructure
Saint Barthelemy has 1 mobile network. Primary carriers: Orange, Dauphin Telecom. Both carrier roaming and eSIM connect to these same networks.
Good to know
Between islands and transport links in Saint Barthelemy, WiFi coverage is moderate. An eSIM running on the local network at $2.17/GB keeps maps and messaging active during transit.
Good to know
Orange is the only mobile network in Saint Barthelemy. Your carrier roaming plan and a travel eSIM both connect to the same towers. The signal quality is identical; only the cost differs.
Frequently asked questions
- Is roaming or eSIM better for Saint Barthelemy?
- For trips longer than 2 days, an eSIM is cheaper than carrier roaming in Saint Barthelemy. AT&T charges $10/day while an eSIM costs $43.34 total for a 10-day trip. Both use Orange's 5G network — the only difference is the price.
- What hidden charges does AT&T have for Saint Barthelemy roaming?
- AT&T's International Day Pass auto-activates when your phone connects to Orange's network in Saint Barthelemy. Calendar-day billing means arriving at 11 PM costs a full $10. Background app sync, voicemail retrieval, and notifications can trigger the daily charge on days you intended to stay offline.
- Do eSIMs use the same network as carrier roaming in Saint Barthelemy?
- Both eSIM and carrier roaming connect to Orange's 5G towers in Saint Barthelemy. The network, coverage area, and download speeds are identical. The difference is pricing: carriers charge $10-$15/day while eSIMs charge a flat rate for the entire trip.
- Is T-Mobile roaming really free in Saint Barthelemy?
- T-Mobile Magenta includes free data in Saint Barthelemy, but speed is throttled to 256 Kbps. That is too slow for maps, video calls, or photo uploads. The high-speed add-on costs $15/day — more expensive than most eSIM plans.
- Can I use eSIM and keep my carrier number in Saint Barthelemy?
- Dual-SIM phones (most models since 2019) run both your carrier SIM and the travel eSIM simultaneously. Your home number stays active for calls and texts over WiFi. The eSIM handles all data on Orange's 5G network in Saint Barthelemy.
- What speed does carrier roaming get in Saint Barthelemy?
- Carrier roaming in Saint Barthelemy connects to Orange's 5G network — the same towers and speeds that an eSIM uses. AT&T and Verizon offer LTE speeds through their day pass. T-Mobile's free tier is capped at 256 Kbps unless you pay for the high-speed add-on.
- Does Verizon auto-charge for roaming in Saint Barthelemy?
- Verizon TravelPass activates automatically when your phone connects abroad in Saint Barthelemy. A single background data transfer triggers the $10/day charge. The only way to avoid it is to disable data roaming in your phone settings before landing.
- How much does carrier roaming cost in Saint Barthelemy?
- T-Mobile includes Saint Barthelemy in its free international plan, but throttles every connection to 256 Kbps — one-eighth the speed of basic 2G. AT&T costs $10/day, Verizon costs $10/day. A travel eSIM on Orange at $5.70 for 1GB provides full 5G — the same towers, none of the speed cap, and less money than either paid carrier option.
- Is T-Mobile's free international data fast enough in Saint Barthelemy?
- No. T-Mobile caps free international data at 256 Kbps in Saint Barthelemy — one-eighth the speed of basic 2G. At that rate, Google Maps takes 15+ seconds to load a single tile and will not work for navigation. Streaming video requires at least 1.5 Mbps; video calls need 2 Mbps. Basic WhatsApp text messages work, but anything else does not. T-Mobile's high-speed add-on for Saint Barthelemy costs $15/day. A travel eSIM on Orange's 5G network delivers full local speeds at $2.17/GB — cheaper per GB than the speed upgrade.
- How is my roaming bill calculated in Saint Barthelemy?
- Your carrier uses one of two models. Per-day billing: AT&T charges $10 and Verizon charges $10 for each calendar day your phone connects in Saint Barthelemy — even if you only check a notification at midnight. Per-MB billing: without a day pass, AT&T charges $2.05 per megabyte, which adds up to $2,099 per GB. Both models penalize casual background data usage. A travel eSIM uses flat-rate billing — you pay 1GB for $5.70 upfront, with no per-day activations and no per-MB overages. Once purchased, the cost is fixed regardless of usage patterns.
- Does my phone need to be unlocked to use a travel eSIM in Saint Barthelemy?
- In most cases, no. eSIM profiles install alongside your existing carrier SIM without requiring an unlock. iPhones purchased in the US after 2020 support dual SIM and eSIM regardless of carrier lock status. Android phones vary — most support eSIM without unlocking, but some budget models require unlocking before a second carrier profile can be installed. US carriers are required to unlock devices after contract fulfillment: AT&T unlocks after 60 days, Verizon after 60 days, T-Mobile after 40 days. If your phone is under contract or recently purchased, check your carrier's unlock policy before your trip to Saint Barthelemy. Rates checked June 2026.
- How much data do TikTok and Instagram use in Saint Barthelemy?
- TikTok at standard quality uses 700 MB/hour of viewing. Instagram Stories and Reels use 500-800 MB/hour depending on video resolution. At $2.17/GB on Orange in Saint Barthelemy, one hour of TikTok costs roughly $1.52 and one hour of Instagram Reels costs roughly $1.41. AT&T International Day Pass at $10/day covers all social media but applies the full daily fee regardless of how little you use. For travelers who browse social apps 30-60 minutes per day, the eSIM still costs less than one AT&T day fee. Rates checked June 2026.