The iris is gray-blue in adults and dark green gray in juveniles.

[2] The male advertisement call is a "whinny" consisting of a rapidly delivered series of 37–45 notes that lasts for about 2.2–2.7 seconds in total.

[2] Oreophryne phoebe inhabits lowland primary and disturbed rainforest.

During the daytime, both adult and juvenile O. phoebe may hide in water-filled axils of Pandanus and other plants.

In 2020 it was concluded that the level of logging prevailing then was not threatening this species but that the situation could change with potential future oil palm and open pit mining projects.