The subscriber base of cellco Tele2 Russia surpassed 7.9 million by the end of June 2007, said the company in its first-half announcement. The Swedish-owned GSM operator, which comprises 14 amalgamated regional networks, posted a record high 33% EBITDA margin in the first six months of 2007, as operating revenue grew by 5% year-on-year to SEK25.947 billion (USD3.865 billion).