How to Call Northern Mariana Islands
Complete guide to dialing Northern Mariana Islands (country code +1-670)
Whether you're planning a tropical getaway or need to connect with friends and family, knowing how to call Northern Mariana Islands is essential for seamless communication. This U.S. territory in the Western Pacific may seem distant, but calling Northern Mariana Islands is surprisingly straightforward once you understand the basics. Our comprehensive guide walks you through step-by-step dialing instructions, helping you avoid common mistakes that could leave you frustrated or facing unexpected charges. You'll discover proper phone etiquette for the islands, learn about the best times to call considering time zone differences, and access a helpful list of essential numbers including emergency services, tourist information, and local directories. Let's make your international calling experience simple and stress-free.
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Quick Reference
Dialing Instructions
How to Dial Northern Mariana Islands
The Northern Mariana Islands uses country code +1-670 for all international calls. Understanding the proper dialing format ensures your calls connect successfully to this US Commonwealth territory.
International Dialing Format Structure
The complete format is: Exit Code + 1 + 670 + Local Number
Northern Mariana Islands phone numbers contain 7 digits after the 670 area code. Unlike many countries, there are no leading zeros to drop when dialing from abroad.
Dialing from the United States
Since Northern Mariana Islands shares country code +1 with the USA, dialing is straightforward:
Example 1 (Landline): To call +1-670-234-5678 from USA
- Dial: 1-670-234-5678
Example 2 (Mobile): To call +1-670-483-9012 from USA
- Dial: 1-670-483-9012
Example 3 (Business line): To call +1-670-322-7654 from USA
- Dial: 1-670-322-7654
Dialing from the United Kingdom
The UK uses exit code 00:
Example 1: To call +1-670-234-5678 from UK
- Dial: 00-1-670-234-5678
Example 2: To call +1-670-483-9012 from UK
- Dial: 00-1-670-483-9012
Dialing from Other Countries
Most countries use 00 as their exit code, though some differ:
- Australia: Dial 0011-1-670-XXX-XXXX
- Japan: Dial 010-1-670-XXX-XXXX
- Canada: Dial 1-670-XXX-XXXX (same as USA)
- China: Dial 00-1-670-XXX-XXXX
Important Notes
- No leading zeros: Northern Mariana Islands numbers don't have leading zeros, so no digits need dropping
- Mobile vs Landline: Both use the same 7-digit format after 670
- Plus sign (+): When saving contacts, use +1-670-XXX-XXXX format for automatic international dialing
- Calling costs: Check with your provider for international rates
Following these formats ensures seamless connectivity to the Northern Mariana Islands from anywhere worldwide.
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Common Mistakes
When calling the Northern Mariana Islands, avoid these common mistakes:
Using the wrong country code. Many people assume the Northern Mariana Islands has a unique country code, but it actually shares +1 with the United States and Canada. The 670 is an area code, not a country code. Always dial +1-670, not just +670.
Forgetting the exit code when calling from landlines. Mobile phones recognize the + symbol, but landlines require your country's exit code. From the US/Canada, dial 011-1-670. From the UK, dial 00-1-670.
Adding a leading zero or 1 before the local number. Simply dial +1-670 followed by the 7-digit local number. Don't add extra digits like +1-670-0 or +1-670-1.
Confusing it with other Pacific territories. Guam uses area code 671, American Samoa uses 684. Double-check you're dialing 670 specifically for the Northern Mariana Islands.
Not accounting for the time difference. The islands are in the Chamorro Time Zone (UTC+10), which affects when it's appropriate to call.
Cultural Etiquette
In the Northern Mariana Islands, phone etiquette blends American communication styles with traditional Chamorro and Carolinian courtesy. Understanding local customs helps build stronger connections in this Pacific territory.
Greetings and Tone
Begin calls with a warm "Hafa Adai" (hello in Chamorro) or a simple "Hello" for both business and personal calls. Locals appreciate friendly, respectful tones that reflect the islands' relaxed atmosphere while maintaining professionalism when needed.
Business vs. Personal Calls
Business calls follow standard American practices with slightly more informal touches. It's acceptable to exchange brief pleasantries before discussing business matters. Personal calls often involve longer conversations, as relationship-building is highly valued in island culture.
Best Times to Call
Avoid calling during early morning hours (before 8 AM) or late evenings (after 9 PM) unless you have a close relationship. Lunch hours (12-1 PM) are generally respected as break times. Remember that family time is sacred in local culture.
Formality Level
While professional settings require courtesy, Northern Mariana Islands communication is generally casual and warm. Use titles like "Mr." or "Ms." when first contacting someone professionally, then follow their lead.
Voice Messages
Keep messages brief but friendly. State your name, reason for calling, and contact information clearly. Returning calls promptly is appreciated and considered respectful.
Cultural Considerations
Patience is valued—avoid rushing conversations. Show respect for elders by using particularly courteous language when speaking with older community members.
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Emergency Numbers
Essential Emergency Numbers:
- 911 - Universal emergency number for police, ambulance, and fire department
- Police (Non-emergency) - (670) 664-9022
- Fire Department (Non-emergency) - (670) 664-2500
- Commonwealth Healthcare Corporation - (670) 236-8201
Important Information:
The 911 emergency number works from all mobile phones and landlines throughout the Northern Mariana Islands and is free to call. Service is available 24/7 with English-speaking operators. As a U.S. Commonwealth territory, the islands follow the American emergency response system.
Mobile phone users should ensure their device has signal coverage, as some remote areas may have limited connectivity. For marine emergencies, contact the U.S. Coast Guard at (671) 339-2042. Keep your location details ready when calling, including the island name and specific landmarks, as response times may vary between islands.
Useful Numbers
Directory Assistance & Information Services
- 411: Local directory assistance for finding phone numbers and addresses throughout the islands
International Services
- 00: International operator for assistance with overseas calls and collect calls
Tourism & Visitor Services
- Marianas Visitors Authority: +1 (670) 664-3200 for tourist information, attractions, and travel assistance
Diplomatic Contacts
- U.S. Consular Agency (Saipan): +1 (670) 236-8636 for American citizen services
- Chinese Consulate: +1 (670) 233-7568
- Korean Consulate: +1 (670) 234-7000
Essential Services
- Commonwealth Healthcare Corporation: +1 (670) 236-8201 for non-emergency medical inquiries
- Department of Public Safety (non-emergency): +1 (670) 664-9022
- Airport Information (Saipan): +1 (670) 664-3500
Utilities
- Commonwealth Utilities Corporation: +1 (670) 235-7025 for water and power services
Tips for Calling Northern Mariana Islands
When calling the Northern Mariana Islands, timing is crucial for successful connections. The islands operate on Chamorro Standard Time (UTC+10), with no daylight saving time changes throughout the year.
Best Times to Call
For business calls, aim for 9 AM to 5 PM local time, Monday through Friday. If calling from the U.S. mainland, remember there's a significant time difference—the islands are 15 hours ahead of EST and 18 hours ahead of PST.
Peak vs Off-Peak Considerations
Off-peak hours (evenings and weekends) often provide better rates for international calls. However, schedule business calls during working hours and always confirm appointments in advance, as island business culture values punctuality and preparation.
Holidays to Avoid
Avoid calling on major U.S. federal holidays, Commonwealth Day (January 9), and local cultural celebrations like Liberation Day (July 4). Typhoon season (July-November) may also disrupt communications.
Communication Tips
Schedule video or phone conferences at least 48 hours ahead. Speak clearly, as connections can occasionally be affected by weather. Have backup contact methods ready, and be patient with any delays in island-based communications infrastructure.
Frequently Asked Questions
The country code for Northern Mariana Islands is +1-670. As a U.S. Commonwealth territory, it shares the +1 country code with the United States but has its own area code, 670, which must be dialed when calling from outside the territory.
To dial Northern Mariana Islands from your cell phone, dial +1-670 followed by the 7-digit local phone number. The plus sign (+) can usually be entered by pressing and holding the zero (0) key on your phone's keypad.
No, you don't need to drop any zeros when calling Northern Mariana Islands because local phone numbers don't begin with a leading zero. Simply dial +1-670 followed by the complete 7-digit local number.
The cheapest way to call Northern Mariana Islands is using ZippCall, which offers affordable pay-as-you-go international calling rates. With ZippCall, you can call from your web browser, iPhone, or Android device with no contracts, no subscriptions, and no hidden fees—just transparent, low-cost rates for calling Northern Mariana Islands.
In Northern Mariana Islands, dial 911 for all emergencies including police, fire, and medical assistance. This is the same emergency number used throughout U.S. territories and provides immediate access to emergency services across the islands.
Yes, you can call Northern Mariana Islands directly from your web browser using ZippCall. Simply visit the ZippCall website, enter the Northern Mariana Islands phone number with the +1-670 prefix, and start your call without downloading any software.
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