Telecom tower companies expanded in a big way following the entry of new operators after 2009. This included names like Videocon, MTS, Uninor etc. Between 2007 and 2010, the number of towers increased sharply from 100,000 to over 310,000 and today there are four lakh towers in India. Indus Towers is the largest, followed by Bharti Infratel, Reliance Infratel and ATC. Following the cancellation of licences and the consequent scaling down of operations, tower companies are now saddled with underutilised infrastructure. In Mumbai, Loop Mobile has exited its operations, while those like Videocon and MTS have reduced their presence. This has had a bearing on their respective tenancy ratio, which needs to be at least 2.1, for the business to remain robust. Simply speaking, it means for every tower, there has to be a minimum of two operators using the infrastructure. Indus Towers, a joint venture between Bharti Airtel, Vodafone and Idea Cellular, has a tenancy ratio of 2.19, and that of Bharti Infratel and Reliance Infratel being less than 2.