The phone code 594 at the beginning of the phone number +594 (subscriber’s phone) means that you are being called from French Guiana or you are calling a subscriber registered in French Guiana.
+594 — French Guiana
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Telephone Code +594 — what country it is
The international phone code +594 officially belongs to French Guiana, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “594″ after the “+” sign to call to French Guiana. Then the next digits of the phone number can be entered.
Whose country code is +594?
+594 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in French Guiana. 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.