Tour du Mont Blanc (TMB)
- 166 km analysed against real cell-tower data
- up to 35% fast 4G/5G data, a further 38% slow 2G/3G only
- 4 dead zones mapped (44 km)
- Mountain estimate — based on tower positions, not terrain, so high-altitude signal may be much lower than shown
Phone signal on the Tour du Mont Blanc: where it drops
TrailSim estimate for the Tour du Mont Blanc: up to 35% of its 166 km has fast 4G/5G data, a further 38% has slow 2G/3G only, and 4 dead zones total 44 km (real cell-tower data, snapshot 2026-09-07).
The stretches below describe the featured plan's networks (CH:Salt · CH:Sunrise · FR:SFR · IT:Iliad · IT:Vodafone · IT:Wind); the figures above follow the plan you selected.
The signal is strongest between La Flégère and Le Crozat, where the model puts fast 4G/5G data at up to 100% of the stage. It runs thinnest between Arnuova Desot and Issert (0% fast data) — expect long stretches where maps and messages crawl or fail.
Choose your eSIM
Typical trip: ~8 days · ~4 GB at 500 MB a day. Plan days start on first connection, so this 30-day plan covers the whole trip.
Plan details
- Data
- 5 GB
- Validity
- 30 days, starting when the eSIM first connects — not at purchase
- Networks
- France: SFR (5G)
Italy: Vodafone (5G) · Wind (5G) · Iliad (5G)
Switzerland: Sunrise (5G) · Salt (5G)
Also valid in 30 other countries - Speed
- 5G · no speed limit
- Calls & SMS
- Data only — no phone number. WhatsApp, FaceTime and other app calls work over data
- Hotspot
- Allowed — share data with your other devices
- Installation
- QR code by email within minutes; settings configure automatically on most phones (APN included in the email). Requires an eSIM-capable, carrier-unlocked phone
- Device
- Locks to the first phone it is installed on and cannot be moved
- Refunds
- Full self-service refund within 14 days while uninstalled — see the refund policy
- Top-up
- One-off plan — if you run out, buying another takes minutes
Data only · Hotspot allowed · Days start on first use · Unlocked eSIM phone required
Plan details
- Data
- 5 GB
- Validity
- 30 days, starting when the eSIM first connects — not at purchase
- Networks
- France: SFR (5G) · Bouygues (5G) · Free Mobile (5G) · Orange (5G)
Italy: Vodafone (5G) · Wind (5G)
Switzerland: Sunrise (5G) · Salt (5G) · Swisscom (5G)
Also valid in 31 other countries - Speed
- 5G · no speed limit
- Calls & SMS
- Data only — no phone number. WhatsApp, FaceTime and other app calls work over data
- Hotspot
- Allowed — share data with your other devices
- Installation
- QR code by email within minutes; settings configure automatically on most phones (APN included in the email). Requires an eSIM-capable, carrier-unlocked phone
- Device
- Locks to the first phone it is installed on and cannot be moved
- Refunds
- Full self-service refund within 14 days while uninstalled — see the refund policy
- Top-up
- One-off plan — if you run out, buying another takes minutes
≈ 12 km more 4G/5G on this route — for $5.76 more
Data only · Hotspot allowed · Days start on first use · Unlocked eSIM phone required
Included with every order
- Secure checkout by Stripe — Apple Pay & Google Pay accepted
- eSIM QR code and coverage report by email within minutes
- 4 dead zones on this route — mapped in your report
- Plan days start on first use, not at purchase
- 14-day self-service refund before installation
Show 8 more 30-day plans
Plan details
- Data
- 1 GB
- Validity
- 30 days, starting when the eSIM first connects — not at purchase
- Networks
- France: SFR (5G) · Bouygues (5G) · Free Mobile (5G) · Orange (5G)
Italy: Vodafone (5G) · Wind (5G)
Switzerland: Sunrise (5G) · Salt (5G) · Swisscom (5G)
Also valid in 31 other countries - Speed
- 5G · no speed limit
- Calls & SMS
- Data only — no phone number. WhatsApp, FaceTime and other app calls work over data
- Hotspot
- Allowed — share data with your other devices
- Installation
- QR code by email within minutes; settings configure automatically on most phones (APN included in the email). Requires an eSIM-capable, carrier-unlocked phone
- Device
- Locks to the first phone it is installed on and cannot be moved
- Refunds
- Full self-service refund within 14 days while uninstalled — see the refund policy
- Top-up
- One-off plan — if you run out, buying another takes minutes
Data only · Hotspot allowed · Days start on first use · Unlocked eSIM phone required
Plan details
- Data
- 3 GB
- Validity
- 30 days, starting when the eSIM first connects — not at purchase
- Networks
- France: SFR (5G)
Italy: Vodafone (5G) · Wind (5G) · Iliad (5G)
Switzerland: Sunrise (5G) · Salt (5G)
Also valid in 30 other countries - Speed
- 5G · no speed limit
- Calls & SMS
- Data only — no phone number. WhatsApp, FaceTime and other app calls work over data
- Hotspot
- Allowed — share data with your other devices
- Installation
- QR code by email within minutes; settings configure automatically on most phones (APN included in the email). Requires an eSIM-capable, carrier-unlocked phone
- Device
- Locks to the first phone it is installed on and cannot be moved
- Refunds
- Full self-service refund within 14 days while uninstalled — see the refund policy
- Top-up
- One-off plan — if you run out, buying another takes minutes
Data only · Hotspot allowed · Days start on first use · Unlocked eSIM phone required
Plan details
- Data
- 3 GB
- Validity
- 30 days, starting when the eSIM first connects — not at purchase
- Networks
- France: SFR (5G) · Bouygues (5G) · Free Mobile (5G) · Orange (5G)
Italy: Vodafone (5G) · Wind (5G)
Switzerland: Sunrise (5G) · Salt (5G) · Swisscom (5G)
Also valid in 31 other countries - Speed
- 5G · no speed limit
- Calls & SMS
- Data only — no phone number. WhatsApp, FaceTime and other app calls work over data
- Hotspot
- Allowed — share data with your other devices
- Installation
- QR code by email within minutes; settings configure automatically on most phones (APN included in the email). Requires an eSIM-capable, carrier-unlocked phone
- Device
- Locks to the first phone it is installed on and cannot be moved
- Refunds
- Full self-service refund within 14 days while uninstalled — see the refund policy
- Top-up
- One-off plan — if you run out, buying another takes minutes
Data only · Hotspot allowed · Days start on first use · Unlocked eSIM phone required
Plan details
- Data
- 10 GB
- Validity
- 30 days, starting when the eSIM first connects — not at purchase
- Networks
- France: SFR (5G)
Italy: Vodafone (5G) · Wind (5G) · Iliad (5G)
Switzerland: Sunrise (5G) · Salt (5G)
Also valid in 30 other countries - Speed
- 5G · no speed limit
- Calls & SMS
- Data only — no phone number. WhatsApp, FaceTime and other app calls work over data
- Hotspot
- Allowed — share data with your other devices
- Installation
- QR code by email within minutes; settings configure automatically on most phones (APN included in the email). Requires an eSIM-capable, carrier-unlocked phone
- Device
- Locks to the first phone it is installed on and cannot be moved
- Refunds
- Full self-service refund within 14 days while uninstalled — see the refund policy
- Top-up
- One-off plan — if you run out, buying another takes minutes
Data only · Hotspot allowed · Days start on first use · Unlocked eSIM phone required
Plan details
- Data
- 10 GB
- Validity
- 30 days, starting when the eSIM first connects — not at purchase
- Networks
- France: SFR (5G) · Bouygues (5G) · Free Mobile (5G) · Orange (5G)
Italy: Vodafone (5G) · Wind (5G)
Switzerland: Sunrise (5G) · Salt (5G) · Swisscom (5G)
Also valid in 31 other countries - Speed
- 5G · no speed limit
- Calls & SMS
- Data only — no phone number. WhatsApp, FaceTime and other app calls work over data
- Hotspot
- Allowed — share data with your other devices
- Installation
- QR code by email within minutes; settings configure automatically on most phones (APN included in the email). Requires an eSIM-capable, carrier-unlocked phone
- Device
- Locks to the first phone it is installed on and cannot be moved
- Refunds
- Full self-service refund within 14 days while uninstalled — see the refund policy
- Top-up
- One-off plan — if you run out, buying another takes minutes
Data only · Hotspot allowed · Days start on first use · Unlocked eSIM phone required
Plan details
- Data
- 20 GB
- Validity
- 30 days, starting when the eSIM first connects — not at purchase
- Networks
- France: SFR (5G)
Italy: Vodafone (5G) · Wind (5G) · Iliad (5G)
Switzerland: Sunrise (5G) · Salt (5G)
Also valid in 30 other countries - Speed
- 5G · no speed limit
- Calls & SMS
- Data only — no phone number. WhatsApp, FaceTime and other app calls work over data
- Hotspot
- Allowed — share data with your other devices
- Installation
- QR code by email within minutes; settings configure automatically on most phones (APN included in the email). Requires an eSIM-capable, carrier-unlocked phone
- Device
- Locks to the first phone it is installed on and cannot be moved
- Refunds
- Full self-service refund within 14 days while uninstalled — see the refund policy
- Top-up
- One-off plan — if you run out, buying another takes minutes
Data only · Hotspot allowed · Days start on first use · Unlocked eSIM phone required
Plan details
- Data
- 20 GB
- Validity
- 30 days, starting when the eSIM first connects — not at purchase
- Networks
- France: SFR (5G) · Bouygues (5G) · Free Mobile (5G) · Orange (5G)
Italy: Vodafone (5G) · Wind (5G)
Switzerland: Sunrise (5G) · Salt (5G) · Swisscom (5G)
Also valid in 31 other countries - Speed
- 5G · no speed limit
- Calls & SMS
- Data only — no phone number. WhatsApp, FaceTime and other app calls work over data
- Hotspot
- Allowed — share data with your other devices
- Installation
- QR code by email within minutes; settings configure automatically on most phones (APN included in the email). Requires an eSIM-capable, carrier-unlocked phone
- Device
- Locks to the first phone it is installed on and cannot be moved
- Refunds
- Full self-service refund within 14 days while uninstalled — see the refund policy
- Top-up
- One-off plan — if you run out, buying another takes minutes
Data only · Hotspot allowed · Days start on first use · Unlocked eSIM phone required
Plan details
- Data
- 50 GB
- Validity
- 30 days, starting when the eSIM first connects — not at purchase
- Networks
- France: SFR (5G) · Bouygues (5G) · Free Mobile (5G) · Orange (5G)
Italy: Vodafone (5G) · Wind (5G)
Switzerland: Sunrise (5G) · Salt (5G) · Swisscom (5G)
Also valid in 31 other countries - Speed
- 4G max · no speed limit
- Calls & SMS
- Data only — no phone number. WhatsApp, FaceTime and other app calls work over data
- Hotspot
- Allowed — share data with your other devices
- Installation
- QR code by email within minutes; settings configure automatically on most phones (APN included in the email). Requires an eSIM-capable, carrier-unlocked phone
- Device
- Locks to the first phone it is installed on and cannot be moved
- Refunds
- Full self-service refund within 14 days while uninstalled — see the refund policy
- Top-up
- One-off plan — if you run out, buying another takes minutes
Data only · Hotspot allowed · Days start on first use · Unlocked eSIM phone required
Pay by the day — from $0.90/day, any number of days
300 MB to 1.5 GB a day at full speed, then slower but never cut off. Set the number of days (1–90) on the payment page — the typical trip length is filled in for you.
≈ $7.20 for the typical 8-day trip — set the number of days on the payment page
Data only · Hotspot allowed · Days start on first use · Unlocked eSIM phone required · expires after your last day
≈ $11.36 for the typical 8-day trip — set the number of days on the payment page
Data only · Hotspot allowed · Days start on first use · Unlocked eSIM phone required · expires after your last day
≈ $35.20 for the typical 8-day trip — set the number of days on the payment page
Data only · Hotspot allowed · Days start on first use · Unlocked eSIM phone required · expires after your last day
Tour du Mont Blanc coverage map
Report preview
Real rows from the report you'll receive — every stage analysed, every dead zone pinned with GPS coordinates.
| Stage | km | 4G/5G | 2G/3G | No signal | Best network |
|---|---|---|---|---|---|
| La Flégère → Le Crozat | 0–25 | 100% | 0% | 0% | SFR |
| Le Crozat → Col de la croix du bonhomme | 25–50 | 42% | 26% | 32% | SFR |
| Col de la croix du bonhomme → Col de la Youlaz | 50–75 | 2% | 52% | 46% | SFR |
| Col de la Youlaz → Arnuova Desot | 75–100 | 80% | 20% | 0% | Vodafone |
| Arnuova Desot → Issert | 100–125 | 0% | 70% | 30% | Vodafone |
| Issert → near Trient | 125–150 | 10% | 22% | 68% | SFR |
| near Trient → La Flégère | 150–166 | 0% | 100% | 0% | SFR |
All 7 stages in the PDF report
| # | Near | Section | Length | Signal drops at | Returns at |
|---|---|---|---|---|---|
| 1 | La Rollaz | 39–47 km | 8 km | 45.79015, 6.71497 | 45.73227, 6.70831 |
…and 3 more dead zones in the PDF report
What you carry with you
The map above shows where the signal holds and where it goes. The report is the version you take with you: on the trail there is no signal, so it is a PDF you keep on your phone or print, plus a GPX track that puts every dead zone on your map app as you walk.
- Every stage of the route with its coverage, kilometre by kilometre
- The strongest network for each stage
- Every dead zone with its coordinates and GPS waypoints
- Printable PDF and a GPX track for your GPS or phone map
Included with every plan, emailed within minutes of purchase.
How this is estimated. Modelled from crowd-sourced cell-tower data (not field measurements) — real signal varies with terrain, weather and network load. Full methodology in the report. Mountain terrain caveat: the model uses tower positions without line-of-sight terrain modelling. In steep valleys and at high altitude real signal is often substantially worse than estimated — treat the figures here as an upper bound. France is retiring its older networks: SFR switches 2G off on 15 November 2026 — that layer is already excluded from these estimates — and 3G by the end of 2028, with the other French carriers on similar timelines; stretches marked 2G/3G only will progressively lose service. Coverage data: OpenCellID (CC-BY-SA 4.0), snapshot 2026-09-07. Route and place names: © OpenStreetMap contributors (ODbL). © 2026 TrailSim.
Frequently asked questions
Is there phone signal on the Tour du Mont Blanc?
On the networks TrailSim sells for the Tour du Mont Blanc, up to 35% of the route's 166 km has fast 4G/5G data and a further 38% has slow 2G/3G only; 4 modelled dead zones totalling 44 km have no signal on its networks. This is a mountain estimate from tower positions without terrain modelling — treat it as an upper bound; field reports put reliable data lower at high altitude. Cell service depends on which networks your eSIM roams on: the plans on TrailSim's Tour du Mont Blanc page are compared against exactly this route, and every dead zone is named and pinned with GPS coordinates in the coverage report included with each eSIM.
How much data do I need for the Tour du Mont Blanc?
Tour du Mont Blanc (TMB) typically takes about 8 days — around 4 GB at 500 MB a day, and the featured plan is picked on exactly that arithmetic. Worldwide, everyday smartphone use averages about 22 GB a month — roughly 730 MB a day — most of it video streaming (Ericsson Mobility Report, Nov 2025). On the trail the picture is lighter: with maps downloaded and video saved for wifi, messaging, photos, weather and bookings run 200–400 MB a day, so we size every recommendation at 500 MB a day for comfortable headroom. Size up if you stream, video-call or share your connection. If you would rather pay only for the days you are out, TrailSim's pay-by-the-day plans for the Tour du Mont Blanc give a full-speed daily allowance that slows down instead of cutting off, with the number of days set on the payment page.
What is a pay-by-the-day eSIM plan?
A daily allowance of 300 MB to 1.5 GB at full speed, then slower for the rest of that day — never cut off. It is priced per day: you set the number of days (1 to 90) on the payment page, pre-filled with the typical Tour du Mont Blanc trip length, and the days start on first use. It suits short trips and people who would rather never run out than carry a large fixed plan; the fixed plans on the same page are cheaper per gigabyte for a long trip.
When do the plan days start counting?
On first use — installing the TrailSim eSIM and connecting starts the clock, not the purchase date. You can safely buy weeks before your trip.
Does my phone support eSIM?
Most phones released since 2019 support eSIM, including iPhone XS and later, Google Pixel 3 and later, and most recent Samsung Galaxy models. Your phone must also be carrier-unlocked.
Why not a regular travel eSIM from Airalo or Holafly?
Any eSIM connects to the same physical networks. What TrailSim adds is the route check: it compares real cell-tower data along the Tour du Mont Blanc itself, picks the network combination that holds best there, and includes the coverage report with every dead zone mapped — so you know before you go where the phone will and won't work. A longer comparison is at trailsim.com/compare/airalo and /compare/holafly.
What if parts of the route have no signal at all?
On most wild routes some stretches have no signal from any network — no eSIM can change that. TrailSim's Tour du Mont Blanc coverage report marks every dead zone with GPS coordinates and length, so you can download offline maps for those sections and tell people at home when you'll be unreachable. Knowing where it drops is the point.
What if I change my mind after buying?
Uninstalled eSIMs qualify for a full self-service refund within 14 days of purchase — no questions asked. Once the eSIM is installed on a device it can no longer be returned. See the refund policy.