What the Uyuni salt flats actually are
The Salar de Uyuni is the world's largest salt flat, a white expanse in the Bolivian altiplano at roughly 3,600 metres above sea level. It is reached from the small town of Uyuni, which has an airport, a bus and train station, and dozens of tour agencies. Almost everyone who comes here does so on a guided tour, because the flats are remote, the roads are unpaved, and the altitude and weather can change quickly.
The three-day tour, explained
A standard three-day tour leaves Uyuni in the morning, spends the first day on the salt flat itself, and then loops south through the Eduardo Avaroa Andean Fauna National Reserve. Nights are usually spent in basic hostels or salt hotels near the reserve. On the third day, most tours either return to Uyuni or drop you at the border for San Pedro de Atacama in Chile.
What is typically included:
- 4x4 transport with a driver-guide
- Fuel, meals and basic accommodation
- Park entry fees, sometimes charged separately
- A one-way drop at the Chilean border, if you booked that option
What is usually not included:
- Flights or buses to Uyuni
- Travel insurance for high-altitude activities
- Sleeping bags, warm layers and cash for extras
Ask before you book whether the tour ends in Uyuni or at the border, because the two versions need different onward plans.
Where you will and will not have signal
Uyuni town has mobile coverage from Bolivian networks, and you can usually get data there. Once the tour leaves town, coverage becomes unreliable. Expect gaps on the salt flat itself, long stretches of the reserve with no signal, and patchy coverage at the hostels. The border crossing to Chile is another place where you should not count on being online.
The practical answer is to prepare offline:
- Download maps, tickets and tour confirmations before you leave Uyuni
- Save your driver's and agency's numbers in your phone
- Tell someone at home your route and expected return
- Keep a power bank, because cold nights drain batteries faster
If you are continuing into Chile, our Chile eSIM guide covers what to expect on the other side of the border. If your trip also includes Peru, the Peru eSIM page explains coverage around Cusco, Lima and the Sacred Valley.
Choosing an eSIM for a Bolivia trip
Bolivia is not one of the destinations covered by an eSIM Americas country store, so there is no Bolivia-only plan to buy here. The realistic options are:
- A regional plan that covers the countries either side of Bolivia
- A local Bolivian SIM bought in Uyuni or La Paz
- Roaming from your home operator
For travellers moving through several countries, the South America eSIM is the plan that matches a route through Chile, Peru, Argentina and Brazil. It keeps you on one plan as you cross borders, which matters when your three-day tour ends at a frontier and you need data again in San Pedro de Atacama.
| Situation | Sensible choice |
|---|---|
| Bolivia only, short trip | Local SIM in Uyuni or La Paz |
| Bolivia plus Chile | South America eSIM plan |
| Bolivia plus Peru and Chile | South America eSIM plan |
| Long multi-country trip to Patagonia | South America eSIM plan |
| North America leg before flying south | North America eSIM plan |
If your trip starts with a North American stopover, the eSIM North America plan covers the USA, Canada and Mexico on one plan before you fly south.
Before you go: a short checklist
- Check your phone supports eSIM before buying anything
- Install the eSIM at home, on wifi, not at the border
- Download offline maps for Bolivia and Chile
- Carry cash in Bolivian bolivianos for park fees and tips
- Pack layers, sunscreen and altitude medication if your doctor advises it
- Keep your tour agency's number saved offline
If your eSIM will not connect once you land, the eSIM not connecting guide walks through the usual fixes, and the install guide covers the setup step by step.
Altitude, weather and timing
The salt flat sits high, and the reserve goes higher. Give yourself a day in Uyuni to acclimatise before the tour starts. The dry season, roughly May to October, gives the classic mirror-flat photos when a thin layer of water sits on the salt. The wet season can close routes and change itineraries, so check with your agency close to your travel date.
Crossing into Chile or Peru afterwards
Many three-day tours end at the border with Chile, near San Pedro de Atacama. From there, buses run south to Santiago and north into Peru. If your route continues to Patagonia, our Patagonia eSIM guide covers signal in El Calafate, Torres del Paine and Ushuaia. If you are heading to Buenos Aires first, the Buenos Aires eSIM page explains coverage in the capital.
