Most countries allow you to purchase SIMS at the airport for cell phone use in the country. Can you do this in Yangon airport (RGN)?
You could buy SIM card at the Yangon International Airport as soon as you arrive. Or you could even find it near the shore of the Airport. Most of they sell are **
Ooredoo, Telenor and MPT
**. All sim price are under $2 dollar. You could get free over 1 hours from Ooredoo and Telenor as soon as you buy them. But those Ooredoo and Telenor are not supported the whole country. To be able to communicate the whole country, you should buy MPT. That's all what I know