Tata Teleservices has found a new partner in Japan's telecom biggie NTT DoCoMo, which has agreed to buy a 26 per cent stake in Tata Teleservices $2.7 billion (Rs 13,300 crore). Interestingly, DoCoMo has valued each subscriber of Tata Teleservices at $344, whereas Idea's subscribers were valued at around $100 during its stake sale.