BELGRADE (Serbia), May 11 (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 4.3 million euro ($6.2 million) in the first quarter of 2011 from a negative EBITDA of 5.0 million euro a year earlier.