MTNL Mahanagar Telephone Nigam Ltd Investments/Divestments Announcement 2023 - Debt MAHANAGAR TELEPHONE NIGAM LTD. has announced the credit rating letter issued by CARE Ratings Limited for proposed NCDs of Rs 6661 Crores backed by Sovereign Guarantee of Government of India..Find Corporate Announcements for Press Releases, AGM, Insider Trading & SAST, Results and Corporate Action for Mahanagar Telephone Nigam Ltd