Dialing telephone calls from the Northern Mariana Islands to the Czech Republic
011
▶ 420
▶ city code
▶ local number
Step-by-step
011
▼ This IDD (International Direct Dial) prefix tells the phone system in the Northern Mariana Islands that you are dialing an international number.
420
▼ Country code for the Czech Republic.
city code
▼ local number
Notes
Not sure what time it is on the other end of the line? Look here for Czech Republic time, date, and time zone information.
If you are calling from a hotel or office phone system, additional steps may be required.