Singapore-based telecom operator Singtel will invest Rs 2,649 crore in Bharti Telecom, increasing its stake in the Indian telecom major to 48.9 per cent. "Airtel Limited...announced that Singapore Telecommunications Limited (Singtel)... will invest Rs 2,649 crore in Bharti Telecom Limited (Bharti Telecom), the promoter company of Airtel through preferential allotment of shares," Bharti Airtel said in a statement.