Country code +674 (dialed as 00 674 from many places) is the tiny Pacific island nation of Nauru, which is in Micronesia in the South Pacific. It is the world's smallest republic with a population of less than 10,000.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
The Kingdom of Tonga is country code +676. There are no city codes or area codes. The local number is 6 digits.
The country code and area code of Naranjal, Paraguay is 595, (0)676.
North American area code +1 676 is unassigned. International country code +676 is the Pacific island kingdom of Tonga.
Leichtenstein is telephone country code +423.
where is telephone country code 1816
That is not a country code.
Fiji has telephone country code +679.
Country code +57 is Colombia.
Gibraltar is country code +350.
Moldova is country code +373.
Slovenia is country code +386.
Vanuatu is country code +678.