New Delhi, Dec. 2 -- All cellphone makers and importers must pre-install the cybersecurity "Sanchar Saathi" app on handsets for sale in India within 90 days, an official directive from the Department of Telecommunications (DoT) said.

A DoT official confirmed the directive and said users can uninstall the app if they want. Media reports initially said the directive had restricted uninstallation of the app.

The app allows users to verify their cellphone's International Mobile Equipment Identity (IMEI) number - a unique ID that helps identify devices--as well as report the misuse of such numbers. Officials said the app was essential to combat "serious endangerment" of telecom cyber security from duplicate or spoofed IMEI numbers, which ena...