To Dial Northern Mariana Islands, you should start with dialing the MP international code +1 then the appropriate area code and the local number.

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How to dial Northern Mariana Islands
Example phone dialings for Northern Mariana Islands
NationalInternational
Fixed Line(670) 234-5678+1 670-234-5678
Mobile(670) 234-5678+1 670-234-5678
Fixed Line Or Mobile(670) 234-5678+1 670-234-5678
Toll Free(800) 212-3456+1 800-212-3456
Premium Rate(900) 212-3456+1 900-212-3456
Personal Number(500) 234-5678+1 500-234-5678