General carrier access codes granted to telecoms operators

Carrier access codes are 5-digit prefixes granted by Traficom. The prefixes identify telecoms operators and are used for selecting an operator for local, long-distance and international calls and for calls made from fixed-line phones to mobile phones.

(https://eservices.traficom.fi/LicensesServices/Forms/NureYleisetOperaattoritunnukset.aspx?langid=en)