LJUBLJANA (Slovenia), April 25 (SeeNews) – Telekom Austria said on Wednesday its wireless unit A1 Slovenija, previously known as Si.mobil, posted earnings before interest, taxes, depreciation and amortisation (EBITDA) of 7.4 million euro ($9.0 million) in the first quarter of 2018, down 39.2% on the year, chiefly due to increased costs and a drop in revenue.