According to a statement released by the Commission, "The UPSC android app has launched on Google Play store for accessing all the examination and recruitment related information via mobile."
It further added that the application would not be permitted to fill out application forms using mobile. The UPSC conducts many examinations, including the prestigious civil services examination, for central government jobs.
The following URL will take you to the UPSC app download page: Click Here
Each year, the preliminary, main, and interview phases of the civil services examination are held to select officers for the Indian Administrative Service (IAS), Indian Foreign Service (IFS), and Indian Police Service (IPS), among other Posts.
For more information read the Official notification