northern ireland is area code 01446 in the uk.
what is area code 01446 in the uk?
northern ireland
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in california and new york, because of the existence of both overlay area codes (where an area code must be dialed for every call) and non-overlay area codes (where an area code is dialed only for calls outside the subscriber's home area code), "permissive home area code dialing" of 1 + the area code within the same area code, even if no area code is required, has been permitted since the mid-2000s. for example, in the 559 area code (a non-overlay area code), calls may be dialed as 7 digits (xxx-xxxx) or 1-559 + 7 digits. the manner in which a call is dialed does not affect the billing of the call. this "permissive home area code dialing" helps maintain uniformity and eliminates confusion given the different types of area code relief that has made california the nation's most "area code" intensive state. unlike other states with overlay area codes (texas, maryland, florida and pennsylvania and others), the california public utilities commission and the new york state public service commission maintain two different dial plans: landlines must dial 1 + area code whenever an area code is part of the dialed digits while cellphone users can omit the "1" and just dial 10 digits.
telephone numbering plan