NTT DoCoMo wants to unload its investment in India’s seventh-largest cellular carrier, Tata Teleservices, in a retreat from India’s challenging market. Japan’s largest mobile telecommunications firm by subscribers said it wants to sell the entire 26.5 percent stake acquired in 2009, citing a range of negative factors. The Japanese company has yet to find a potential buyer, but it has decided to exercise its option to sell the stake if TTSL didn’t meet performance targets in the fiscal year to March 31, 2014.