BELGRADE (Serbia), August 17 (SeeNews) – Telekom Austria Group said on Wednesday its Serbian wireless unit, Vip Mobile, turned to a positive EBITDA (earnings before interest, tax, depreciation and amortisation) of 11.9 million euro ($17.2 million) in the first half of 2011 from a negative EBITDA of 7.2 million euro a year earlier.