The latest direction from the DoT follows an earlier order requiring handset makers to install panic button in all new phones to be sold January 1, 2017 onwards.
For existing phones, the handset makers will also have to arrange for installation of new software patch at retail outlets, DoT said in a recent order without specifying any timeline for the compliance.
The software patch will provide facility similar to panic button which at the press of '9' or '5' will generate a call to single emergency telephone number '112', the order said
"... It is requested to install the software patch (es) in existing mobile phone handsets in the country for implementation of feature/facilities of panic button," the DoT order said.
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"Further facility for uploading the developed patch may be created at outlets by the manufacturers/ distributors/ retailers of mobile handset," the order said.
The government in April mandated that all mobile phones in the country from January 1, 2017 will be sold with panic button feature.
Also, from January 1, 2018, government has mandated that no mobile phone handset manufacturer shall sell the new mobile phone handset in India without the facility of identifying the location through Satellite based GPS.
The concept of a device with panic button feature was floated after brutal gangrape of a paramedical student in Delhi.
The Ministry of Finance in December 2013 had approved a Nirbhaya Fund, following the incident, under which integration of the police administration with mobile phone network to trace and respond to distress calls with minimum response time was to be done.