Shares of Tata Teleservices (Maharashtra) were locked in a five per cent upper circuit at Rs 276.50 after its board decided to convert interest on its adjusted gross revenue (AGR) debt into equity and post conversion, the government's holding in the company is expected to be around 9.5 per cent. The announcement of Tata Teleservices (Maharashtra) came within hours of Vodafone Idea also deciding to opt for converting the interest amount on AGR dues into government equity.