Dialing telephone calls from Nigeria to Slovakia
009
▶ 421
▶ city code
▶ local number
Step-by-step
009
▼ This IDD (International Direct Dial) prefix tells the phone system in Nigeria that you are dialing an international number.
421
▼ Country code for Slovakia.
city code
▼ local number
Notes
Not sure what time it is on the other end of the line? Look here for Slovakia time, date, and time zone information.
If you are calling from a hotel or office phone system, additional steps may be required.