Acting on a tip-off, officers arrived at the scene, on the roof of an apartment building on Yaowarat Rd in Phuket Town, to find five foreigners working at the site.
Present at the scene, Thai national Sittichai Klapdee admitted to officers that he was responsible for overseeing the work done. He picked up and brought the workers each day, and dropped them off at night.
The officers also found that foreign workers were installing cable systems to provide Chinese TV channels. Tourist Police reported.
Three of the foreigners were found to be working without a work permit: Chinese nationals Wang Hao, 29, and Zhang Shaowen, 49; and Myanmar national Chit Ko Oo, 22.
The three were taken to Phuket Tourist Police headquarters for questioning and verification of their visa status.
Wang Hao had entered Thailand on a tourist visa on May 18. The visa permitted him to stay until June 16. Zhang Shaowen entered Thailand on a tourist visa on May 4. His visa permitted him to stay until June 2, Tourist Police reported.
Speaking through a Chinese interpreter, both Zhang Shaowen and Wang Hao told officers they had worked for about two days. They were hired to work for B40,000 a month. The salary was to be transferred via the WeChat system from Yong Thong Company based in Bangkok.
Myanmar national Chit Ko Oo had legally entered Thailand on May 2, Tourist Police also confirmed.
Giving his statement through an interpreter, Chit Ko Oo said that he had been working on the current job for about nine days. His monthly salary was B15,000 and he was paid by Wang Hao.
All three admitted to working without a work permit, Tourist Police said in their report.
The three foreigners were taken to Phuket City Police Station and charged with working illegally, Tourist Police confirmed.