How much data do I need for Walker’s Haute Route (Chamonix–Zermatt)?

Aim for at least 500 MB a day — comfortable headroom for daily navigation, booking accommodation, messaging home and uploading photos. The featured plan is picked on exactly that rule; size up if you stream, video-call or share your connection.

When do the plan days start counting?

On first use — installing the 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.

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.

Best eSIM for Walker’s Haute Route

Name: Walker’s Haute Route (Chamonix–Zermatt) eSIM with route coverage report
Brand: TrailSim
Availability: InStock

Coverage map

Segment-by-segment

Stage	km	4G/5G	2G/3G	No signal	Best network
Chamonix-Mont-Blanc, Auvergne-Rhône-Alpes → Trient, Valais/Wallis	0–25	30%	62%	8%	SFR
Trient, Valais/Wallis → Sembrancher, Valais/Wallis	25–50	0%	58%	42%	Sunrise
Sembrancher, Valais/Wallis → Nendaz, Valais/Wallis	50–75	0%	14%	86%	Sunrise
Nendaz, Valais/Wallis → Evolène, Valais/Wallis	75–100	0%	0%	100%	—
Evolène, Valais/Wallis → Anniviers, Valais/Wallis	100–125	76%	0%	24%	Sunrise
Anniviers, Valais/Wallis → Oberems, Valais/Wallis	125–150	86%	14%	0%	Sunrise
Oberems, Valais/Wallis → St. Niklaus, Valais/Wallis	150–175	68%	2%	30%	Salt
St. Niklaus, Valais/Wallis → Zermatt, Valais/Wallis	175–200	100%	0%	0%	Salt
Zermatt, Valais/Wallis → Zermatt, Valais/Wallis	200–208	100%	0%	0%	Salt

Dead zones — download offline maps before these

#	Near	Section	Length	Coords
1	Trient, Valais/Wallis	23–36 km	13 km	46.02468, 7.02398
2	Hérémence, Valais/Wallis	54–106 km	53 km	46.07132, 7.38017
3	Ergisch, Valais/Wallis	151–158 km	8 km	46.21204, 7.71229

How this is estimated. Coverage is modelled from OpenCellID crowd-sourced cell-tower locations. A point counts as covered by an operator if it falls within a conservative per-technology range of one of that operator's towers (5G 3 km / 4G 6 km / 3G 5 km / 2G 12 km). This flags stretches where you're likely to lose signal, but it is an estimate from public data—not a field measurement or guarantee. Real signal varies with terrain, weather and network load.

Walker’s Haute Route (Chamonix–Zermatt)

Other 30-day plans

Coverage map

Segment-by-segment

Dead zones — download offline maps before these

Frequently asked questions