ANSWER: 500
Explanation:
A study by global telecom body GSMA has found that India is set to have more than half a billion (500 million) unique mobile subscribers by the end of the year, thanks to affordable devices, easy tariff and digital literacy drives. The report, entitled "The Mobile Economy: India 2015", said that 13% of the world's mobile subscribers lived in India. The subscriber growth was forecast to outperform the regional and global averages in the coming years. India is currently positioning itself as the second largest mobile market after China.