The phone code 503 at the beginning of the phone number +503 (subscriber’s phone) means that you are being called from El Salvador or you are calling a subscriber registered in El Salvador.
+503 — El Salvador
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Telephone Code +503 — what country it is
The international phone code +503 officially belongs to El Salvador, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “503″ after the “+” sign to call to El Salvador. Then the next digits of the phone number can be entered.
Whose country code is +503?
+503 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in El Salvador. 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.