Calling Tonga from the United States explained:

• 011 - US exit code; dial first for international calls made from the USA or Canada
• 676 - Country Code for Tonga
• Phone Number - 5 digits for landlines and 7 digits for mobile numbers
• US to Tonga landlines international dialing format: 011 676 ?? ???

How to dial to Tonga cellular:

• dialing format for calls to a cell phone: 011 676 ??? ????

Phone Books:

• Official visitors guide
• Tonga Phone Directory - residential and business listings