MTNL Mahanagar Telephone Nigam Ltd Investments/Divestments Announcement 2023 - Equity, Debt, VC, Private Equity Investments, Joint Ventures, Disinvestments MAHANAGAR TELEPHONE NIGAM LTD. has announced the exercise of CALL OPTION and RECORD DATE INE153A08055 for 1000 no. 8.28% Government of India Guaranteed Unsecured Rated Listed Redeemable Non-Convertible and Taxable Bonds in the Nature of Debentures Series IV-B for Rs. 100 Crores.Find Corporate Announcements for Press Releases, AGM, Insider Trading & SAST, Results and Corporate Action for Mahanagar Telephone Nigam Ltd