MHz, leveraging its legacy NMT network. In 2012, O2 Czech Republic opened its network to virtual operators. On 1 June 2015, O2 Czech Republic has been separated into two mutually independent companies. O2 is the retail operator with the infrastructure provided by CETIN. The separation includes commercial and managerial leadership and management of both companies, including security, IT and control systems. References External links Mobile phone companies of the Czech Republic Telecommunications companies established in 2006 2006 establishments in the Czech Republic Telefónica PPF Group