Laos eSIM

Intermittently. The line runs through a great many tunnels in the mountains, so service disappears inside them and returns in open country. If you need to send work or make a call, deal with it before boarding, and download your ticket and a map of the destination to the phone beforehand.

Install the eSIM profile on the Thai side while you still have Wi-Fi, then enable the line after you clear Lao immigration. If the handset is still holding a Thai tower, toggle flight mode once to force a fresh network search, and check that data roaming is switched on for that line.

On busy dates the Vientiane–Luang Prabang seats sell out quickly, so many travellers ask their guesthouse or a local agency to buy on their behalf — the most reliable route if you have no Lao bank account. Arrange it in advance over chat and leave time to collect the ticket before your travel day.

Download an offline map of the whole route and save your accommodation address as an image, because the mountain road loses signal for long stretches and Muang Ngoi is reached by boat on top of that. Bring a power bank as well: some guesthouses only have electricity for part of the day.

Most plans here start when the phone first connects to a network at the destination, so you can install in advance at home and switch it on after landing. Each plan page states its own rule.

No. The eSIM is a second line, so you keep your home number for SMS OTP. Turn off roaming data on the home line and set the eSIM as the data line.