Slovakia Dialing Code - Slovak Country Code - Telephone Area Codes in Slovakia

Thinking of making a phone call to Slovakia and not sure what is the country dialing code for Slovakia or want to know the local telephone area codes of cities in Slovakia?

How to Call a Slovak Telephone Number from Abroad?
Country Dialing Code for Slovakia: 421
International Call Prefix to call from Slovakia: 00
Trunk Prefix of Local Phone Numbers in Slovakia: 0