The phone code 856 at the beginning of the phone number +856 (subscriber’s phone) means that you are being called from Laos or you are calling a subscriber registered in Laos.
+856 — Laos
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Telephone Code +856 — what country it is
The international phone code +856 officially belongs to Laos, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “856″ after the “+” sign to call to Laos. Then the next digits of the phone number can be entered.
Whose country code is +856?
+856 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Laos. 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.