Réunion eSIM: Stay Connected from Saint-Denis to the Volcano

Réunion packs an active volcano, deep green cirques and lagoon beaches into one French island in the Indian Ocean, and you will want working maps from the moment you land. Most visitors arrive at Roland Garros Airport near Saint-Denis, while some regional flights use Pierrefonds Airport near Saint-Pierre. A HelloSIM eSIM lets you install your data plan at home and get online as soon as you step off the plane.

Why use an eSIM in Réunion

• No hunting for a phone shop after a long-haul flight: the eSIM is installed before you leave home.
• Reliable navigation on the island's winding mountain roads, such as the routes up to Cilaos and Salazie.
• Weather and trail updates before a hike, on an island where mountain conditions change quickly.
• Your own SIM stays in the phone, so your usual number keeps receiving calls and texts.
• The data is prepaid, so no roaming bill is waiting for you when you get home.

Plans in Réunion often change with the weather: a cloudy morning on the volcano can mean heading to the beach instead at short notice. With your own data connection you can check webcams, road conditions and opening times wherever you are, rather than waiting until you are back at your accommodation.

Networks and coverage

The HelloSIM eSIM for Réunion connects to Orange and Free, with 5G where those networks offer it and your phone supports it, and 4G/LTE elsewhere. Coverage is strongest in and around Saint-Denis, Saint-Pierre and Saint-Paul, along the busy west coast between Saint-Gilles and Saint-Leu, and on the main coastal roads.

Inland, the picture changes. The villages of the Cilaos and Salazie cirques generally have signal, but deep valleys and steep ridges can block it. The Cirque de Mafate has no roads at all and is reached only on foot or by helicopter, so expect long stretches of trail without coverage. Signal can also be patchy on the high ground around Piton des Neiges and Piton de la Fournaise, and along the wilder south-east coast.

How to get connected

1. 1Buy your Réunion plan and check your inbox: the QR code is delivered by email straight away and is also saved in your HelloSIM account and app.
2. 2Install the eSIM at home over Wi-Fi. On iPhone go to Settings → Mobile/Cellular → Add eSIM; on Android look under Settings → Network & internet or Connections → SIM manager → Add eSIM.
3. 3When you land, switch the HelloSIM line on, choose it for mobile data and turn on Data Roaming for that line. Turn data roaming off on your home line.
4. 4Validity starts when the eSIM first connects to a network in Réunion. If you need more, top up the same eSIM from the app, your account or the Check / Top up page.

How much data do you need

• Light (about 1 GB a week): maps, messaging and the odd weather check.
• Medium (3–5 GB a week): social media, browsing and uploading photos from viewpoints and beaches.
• Heavy (10 GB or more): video calls, streaming or working remotely from a rented villa.

Hotels and guesthouses on the coast usually offer Wi-Fi, but it can be slow or missing in mountain gîtes, so plan to rely on your own data inland.

Good to know

• Currency: euro (EUR).
• Capital: Saint-Denis.
• Languages: French; Réunion Creole is widely spoken.
• Time zone: UTC+4, with no daylight saving time.
• Plug type: Type C and E, as in mainland France.
• Don't miss: the Piton de la Fournaise volcano, the roadless Cirque de Mafate, and the lagoon beaches around Saint-Gilles and L'Hermitage.

Travel tips for staying connected in Réunion

• Download offline maps of the whole island before you hike; trails into Mafate and up Piton des Neiges run far from any mast.
• Start early: cloud often builds over the mountains as the day goes on, so check the forecast and road updates while you still have signal.
• Carry a power bank in your daypack, because a phone searching for a weak signal in the cirques drains its battery faster.
• On a helicopter flight over the cirques or a boat trip to spot dolphins and whales, expect the signal to fade once you are away from the coast.
• Before heading into an area without coverage, share your route with someone and save your accommodation details offline.