The phone code 855 at the beginning of the phone number +855 (subscriber’s phone) means that you are being called from Cambodia or you are calling a subscriber registered in Cambodia.
+855 — Cambodia
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Telephone Code +855 — what country it is
The international phone code +855 officially belongs to Cambodia, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “855″ after the “+” sign to call to Cambodia. Then the next digits of the phone number can be entered.
Whose country code is +855?
+855 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Cambodia. 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.