title: O2 Slovakia
text: # O2 Slovakia
  
  O2 Slovakia, s.r.o. is a provider of mobile service in Slovakia. O2 started as Telefónica in Slovakia with commercial services on 2 February 2007 with about 600.000 preregistered users, and ~400,000 Slovaks actively using the $O_2$ service. The operator has 1 700 000 active SIM cards (3 month activity) to date 1 September 2015. The company is subsidiary of O2 Czech Republic, itself owned by PPF.
  
  ## Prefix
  
  Users are identified by prefix 940, 944, 948 and 949 in mobile number. (+421 94x yyy yyy)
  
  ## Headquarters
  
  O2 Slovakia, s.r.o, Einsteinova 24, SK- 851 01 Bratislava, Bratislava, Slovakia
  
  