The phone code 853 at the beginning of the phone number +853 (subscriber’s phone) means that you are being called from Macao or you are calling a subscriber registered in Macao.
+853 — Macao
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Telephone Code +853 — what country it is
The international phone code +853 officially belongs to Macao, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “853″ after the “+” sign to call to Macao. Then the next digits of the phone number can be entered.
Whose country code is +853?
+853 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Macao. 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.