...central European country, it said on Thursday.
Telefonica O2 Slovakia is a unit of Telefonica O2 Czech Republic, itself majority owned by the Spanish operator Telefonica .
Telefonica won a Slovak licence in August last year.
It has said it had registered 600,000 potential clients who showed interest in the firm's services.
Telefonica O2 Slovakia will compete with Deutsche Telekom's T-Mobile and France Telecom unit Orange in Slovakia, a country of 5.4 million people.
Analysts have said the growth in the Slovak market was an important factor for the Czech Telefonica O2, the former fixed-line monopoly which also provides mobile services.
[PRAGUE/Reuters/Finance.cz]