Sistema Shyam TeleServices Limited (SSTL) has launched CDMA services in the West Bengal circle. The company has invested $80 million in the Kolkata and West Bengal service areas so far and intends to invest $150 million over the next four years. The company has already launched CDMA services in the Tamil Nadu, Kerala and Rajasthan circles. SSTL is targeting a 10 per cent market share in the Indian mobile market in the next five years.