The largest mobile operator in Turkey, TurkCell, starts negotiations on acquisition of assets of TeliaSonera in Azerbaijan, a source in the TurkCell company told Trend Sept.18. "It is expected that the negotiations between the Azerbaijani mobile operator Azercell Telecom LLC company and TurkCell about the latter's control over Azerbaijani mobile operator will be held early next week in Baku," said the source.