Sri Lanka's mobile network has matured fast. Dialog Axiata and Mobitel together cover the island's main tourist corridors with reliable 4G, and a third operator, Airtel Sri Lanka, fills additional urban gaps. For most of the journey a French or Dutch traveller actually takes, the signal is solid.

Colombo, the commercial capital, is well-served across the entire metropolitan area. Galle and the southern coastal strip, Kandy and the Cultural Triangle, and the train route through Ella all fall within strong 4G zones. Kolet's Sri Lanka plans connect through Hutchison (LTE/4G) and Mobitel (LTE/4G), giving you two network partners to lean on when one mast is busy.

Where things get thinner: the deep hill country above Nuwara Eliya, remote sections of Yala and Wilpattu national parks, and rural roads between minor towns. You will get connectivity for navigation and messaging in most cases, but do not expect seamless video calls while tracking a leopard from a jeep. Download your offline maps before leaving the hotel. That is the honest picture.

UN Tourism data shows Sri Lanka's international arrivals recovering sharply after 2022, with European travellers consistently among the fastest-growing segments. The infrastructure investment has followed demand. 5G rollout began in selected Colombo districts in 2025, though most travel eSIMs, including Kolet, currently connect on LTE/4G across the island, which is more than sufficient for everything from Google Maps to Instagram Stories.

The setup takes under five minutes, and all of it happens at home on Wi-Fi before you even pack your bag. Here is the sequence.

First, download the Kolet app and create your account. If you hold an Air France-KLM Flying Blue number, go to Profile, then Promo Codes and Rewards, then Loyalty Program and Miles, then Flying Blue, and enter your number now. Not after you buy. Now. Miles are not credited retroactively, so linking first is the only step that actually matters for loyalty.

Next, pick your plan. For Sri Lanka, Kolet offers two directions. If you know roughly how much data you will use, a Standard Plan gives you a fixed gigabyte allowance at full speed until the last megabyte, with 30-day validity from first connection. Prices start at €3.99 for 1 GB, €5.99 for 3 GB, €7.99 for 5 GB, €11.99 for 10 GB, and €19.99 for 20 GB. Any unused data at expiry converts to Koins in your wallet rather than disappearing. For a ten-day trip mixing city time in Colombo with beach days in Mirissa, a 10 GB Standard Plan is a comfortable, waste-light choice.

Install the eSIM profile over Wi-Fi at home. Your physical SIM stays in the tray, so your home number remains fully active. When you land in Colombo, toggle the Kolet eSIM on in your settings. Data does not begin until you actually use the first megabyte, so there is no countdown ticking during the flight. If you run through a Standard Plan mid-trip, you can top up directly in the app without reinstalling anything.

Every euro you spend on any Kolet plan earns 10 Flying Blue Miles, provided your account was linked before purchase. On a €19.99 plan, that is nearly 200 Miles added to your Flying Blue balance before you have even left the airport tarmac.

Here is the friction nobody mentions in travel blogs until you are already standing in the arrivals hall at Bandaranaike International Airport, exhausted, luggage carousel chaos behind you.

Sri Lanka's Telecommunications Regulatory Commission (TRCSL) mandates passport registration for all prepaid SIM card purchases by foreign nationals. That means presenting your passport, waiting for the agent to process the details, and sometimes queuing behind a dozen other arrivals doing exactly the same thing.

Once registered, you now have a second active number on a second physical SIM. Your home number goes dark the moment that card takes over the primary slot. Friends, family, your bank's two-factor authentication texts: all diverted or missed. Swapping SIMs back and forth for the next two weeks is nobody's idea of fun.

An eSIM installed before departure skips every single one of those steps. No queue. No passport handed over at a kiosk. No second number. Your home line stays live throughout the trip.