Bhutan is a Himalayan kingdom of fortress-monasteries, prayer flags and a single winding highway, and it sits outside almost every roaming bundle you are likely to own. Install the eSIM before you fly and you are online while the aircraft is still cooling on the apron at Paro.


Nearly everyone arrives at Paro, the country's only international airport, after one of the more memorable approaches in aviation; overland travellers cross from India at Phuentsholing, with smaller gates further east. Either way your guide and driver are usually waiting outside, and the first thing you will want is a message home and a map of the road to Thimphu.

Bhutan's people live in its valleys, and so do its masts. Thimphu, Paro, Punakha and the other district towns have dependable 4G, and the main east–west highway is covered for much of its length.
Between the valleys it is a different story. On the high passes — Dochula, Pele La, Thrumshing La — and in the deep forested gorges the signal comes and goes with every bend. On the trekking routes, from the Druk Path to Jomolhari and beyond, expect none at all after the first day. The further east you travel, the longer the gaps.

Bhutan has only a couple of mobile networks and few roaming agreements worth the name. For most home plans it sits in the most expensive band on the price list, and "worldwide" travel passes very often leave it out altogether — check yours, and read the per-megabyte rate if you do.
A local tourist SIM is possible, but it means a counter, your passport and a registration form while your driver waits.
A travel eSIM takes the question away: a fixed price, paid before you leave, on a local network.
The highway east from Thimphu is one lane and a half of continuous bends, and a journey that looks short on the map takes most of a day. Signal drops out between valleys, so save offline maps, your hotel confirmations and your permits to the phone before setting off.
If winding roads trouble you, sit in the front, keep your eyes on the horizon and leave the scrolling for the next town.
Paro and Thimphu sit well above two thousand metres, the passes above three, and Tiger's Nest is a steep climb on top of that. Give yourself a day or two before the big walks, drink more water than seems necessary and start early.
Cold drains a phone battery faster than you expect on the passes: keep it in an inside pocket and carry a power bank.
Sometimes, and rarely cheaply. Bhutan is missing from many operators' roaming lists, and where it does appear it is usually in the dearest zone and excluded from daily or "worldwide" passes. Check your operator's price list before you rely on it, or use a travel eSIM and know the cost in advance.
On most of the trail, usually yes — the path climbs a slope that looks straight down on the Paro valley, and the cafeteria viewpoint is normally in range. It becomes patchy in the ravine just below the monastery, and phones have to be left in a locker before you go inside in any case.
Expect 4G in the towns and along the main valleys. 5G has been introduced in limited areas, and whether your plan uses it is shown on each plan's card.
No — a Bhutan plan covers Bhutan. If you are coming overland through West Bengal or Sikkim, India has its own plans, and for a longer Himalayan journey through several countries a regional plan is the simpler choice.
No. Tourist SIMs are sold in Paro and Thimphu, but they require your passport and a registration form, and the queue comes at the moment you least want one. An eSIM installed at home is active as soon as the phone finds a Bhutanese network.
Carry cash. The currency is the ngultrum, held at par with the Indian rupee; larger hotels and some handicraft shops take cards, but small restaurants, markets and anything outside the main towns generally do not. ATMs exist in the towns and do not always accept foreign cards, so withdraw when you can.
One eSIM can cover Bhutan and the countries around it — no need to buy a plan at every border:
Plans for the countries next door:
Where the signal is, how roaming treats the place, and what to know before you land.