<P> Ireland uses the trunk prefix 0 to access numbers outside your local area . This is followed by an area code, referred to as an NDC (National Dialling Code .) The first digit of the NDC indicates the geographical area or type of service (e.g. mobile). </P> <P> Calls made from mobile phones and some VoIP systems, always require the full area code and phone number . In common with most European countries, the trunk prefix 0 must be omitted when calling Irish numbers from abroad . </P> <P> Irish area codes vary in length, between one and three digits (excluding the leading 0), and subscribers' numbers are between five and seven digits . A migration to a standard format, (0xx) xxx xxxx, is in progress; however, to avoid disruption, this process is only being carried out as needed where existing area codes and local numbering systems have reached full capacity . There is currently no plan to move to a closed numbering system . </P> <P> Irish geographical numbering is structured on a regional basis and follows a logical hierarchy . Two - digit telephone directory areas are divided into multiple area codes called NDCs (National Dialling Codes). </P>

How many digits in an irish phone number
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