The Department of Telecommunications (DoT) has made it mandatory to prefix 0 for all calls made from fixed lines to mobiles, effective January 15, 2021.

Earlier, in May 2020, the Telecom Regulatory Authority of India (TRAI) had recommended a 0 prefix for all such calls to create sufficient numbering space for telecom service providers.

In addition, the department has also asked the telcos to furnish details of number series, both mobile and fixed-lines, allotted to them and the utilisation of the series.

These details, in each calendar year, have to be submitted to the DoT by January 15, of the next year.