(Telecompaper) PPF Telecom Group said it has completed the separation of the retail and infrastructure activities at three of its Telenor-branded mobile operators, in Bulgaria, Hungary and Serbia. The network infrastructure has been spun off into a new company under the name Cetin, the same as at PPF's Czech operators. The company said Cetin will become the telecommunication infrastructure backbone of PPF Telecom Group as well as serve wholesale customers.