Telephone country code +671 (dialed as 00 671 from many places) was previously used for Guam, a U.S. territory in the Pacific. It is now unused.
Guam is now +1 670. From North America (USA, Canada, etc.), dial 1-670 and the 7-digit local number. Calls from the USA should be billed at domestic rates.
(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 ares code for Guam is 671
The country code and area code of Hoting, Sweden is 46, (0)671.
The country code and area code of Cuttack- Cuttack, India is 91, (0)671.
The country code and area code of Bad Kreuznach, Germany is 49, (0)671.
Leichtenstein is telephone country code +423.
where is telephone country code 1816
That is not a country code.
There is no 909 country code.
There is no telephone country code +897, nor +89, nor any other country code beginning with +89. There are no valid telephone numbers beginning with +89.
you dial 1 + 671
Gibraltar is country code +350.
Moldova is country code +373.