the 548 area code was the second area code overlay for the 519 region. the new code was activated on june 4, 2015.canadian numbering administrator (cna) advised the crtc on october 12, 2011 that based on the current rate of expansion the current numbering system would be exhausted by january 2017. the crtc in response developed a relief plan ("telecom decision crtc 2012-655") which set the framework for addressing the exhaustion and oversee the addition of an additional overlay number. area code 382 has been reserved as a fourth code for the region.