Will my Sri Lanka operator provide a local SIM card?

Many high-end Sri Lankan travel agencies hand over a complimentary tourist SIM card right after arrival, usually already set up with basic data plus a handful of local calling minutes.

Even if it is not complimentary, your guide tends to walk you to the official telecom counters, like Dialog or Mobitel, that are placed inside the airport arrivals hall. They take care of the registration using your passport so you get solid 4G/5G internet access for the whole itinerary before you even step outside.