The phone code 506 at the beginning of the phone number +506 (subscriber’s phone) means that you are being called from Costa Rica or you are calling a subscriber registered in Costa Rica.
+506 — Costa Rica
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Telephone Code +506 — what country it is
The international phone code +506 officially belongs to Costa Rica, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “506″ after the “+” sign to call to Costa Rica. Then the next digits of the phone number can be entered.
Whose country code is +506?
+506 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Costa Rica. 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.