Mobile network area codes
The telephone numbers of mobile networks and services begin with 04 or 050. Traficom grants telecoms operators mobile network area codes, or prefixes, that have 3 to 5 digits.
(https://eservices.traficom.fi/LicensesServices/Forms/NureMatkaviestinverkkojenSuuntanumerot.aspx?langid=en)
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