Telecompaper reports that Russian and CIS mobile operator MTS posted a net loss of US$26.1 million for the fourth quarter, versus a profit of US$171.2 million a year earlier, due mainly to one-time charges for its takeover of fixed-line operator Comstar-UTS. The company wrote down investments for US$368 million, most of which is due to Comstar’s stake in Svyazinvest, and took another US$86 million in charges for obsolete equipment and expenses related to the acquisition of Comstar and tax provisions. Revenues for the quarter fell 3.3 percent from a year earlier to US$2.72 billion, and OIBDA was down 10.1 percent to US$1.19 billion.