February 20 (SeeNews) - Croatia's Optima Telekom [ZSE:OPTE-R-A] said on Tuesday it swung to a consolidated net loss of 58.9 million kuna ($9.8 million/7.9 million euro) in 2017, from a profit of 13.8 million kuna a year earlier, mostly due to the merger with H1 Telekom.