Thandar Tun waits for customers at a public call office (PCO) phone shop in Yangon May 27, 2012. Blackberrys and iPhones aren't much use in Myanmar, where its only network is frequently jammed, data services are scarce, prices extortionate, lines crackly and most phones don't roam. For decades, its telecoms industry has been a shambles. But as Myanmar races ahead with economic reforms, the telecoms sector, riven with graft and mismanagement and lagging behind even Asia's poorest countries, is on the verge of a major shake-up as part of a "reform plan" to liberalise one of the world's last remaining greenfield telcos markets. To match Insight MYANMAR-TELECOMS/ Picture taken May 27, 2012. REUTERS/Jason Szep (MYANMAR - Tags: BUSINESS TELECOMS)