There are light yellow spots forming a row that runs from beneath the eye through the flank to the groin.

[2] The male advertisement call consists of a series of 2–5 distinct notes, each lasting 18–38 ms, for a total duration of 0.08–0.35 seconds.

[2] Ansonia phuketensis is only known from its type locality, Kathu waterfall, on Phuket Island, at 82 m (269 ft) above sea level.

Although suitable habitat exists elsewhere on the island and on the mainland, it is likely that the true range of this species is restricted; its current estimated extent of occurrence (EOO) is only 5 km2.

[1] Ansonia phuketensis is listed as "endangered" because it is only known from a single locality and habitat deterioration is occurring in the area.