The phone code 1671, 671 at the beginning of the phone number +1671, 671 (subscriber’s phone) means that you are being called from Guam or you are calling a subscriber registered in Guam.
+1671, 671 — Guam
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Telephone Code +1671, 671 — what country it is
The international phone code +1671, 671 officially belongs to Guam, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “1671, 671″ after the “+” sign to call to Guam. Then the next digits of the phone number can be entered.
Whose country code is +1671, 671?
+1671, 671 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Guam. It does not mean that a subscriber is definitely there at the time of the call (since he or she can make a call in roaming), but there is such a possibility.