centres, which have never been amalgamated. The city centre exchange (serving the former cities of Hull and Pointe-Gatineau) is still named "Ottawa-Hull," and the "Gatineau" exchange serves only the pre-merger city of Gatineau. The Gatineau and Aylmer exchanges, despite being part of the amalgamated municipality of Gatineau, remained long-distance calls to each other until a 16 August 2007 expansion of their local calling area, five years after the merger. Many smaller rate centres do not need nearly that many numbers in order to adequately serve their customers, but a number cannot be assigned elsewhere once it has been allocated to a carrier and rate centre. That resulted in thousands of wasted numbers, and the proliferation of cell phones and pagers have exacerbated the problem. By 2006, area code819 was effectively exhausted except for central office codes that theoretically could have been assigned in Hull but only by breaking seven-digit dialling between Ottawa and Hull. The situation could have been avoided if some +1-819 versions of the seven-digit Ottawa-Hull numbers had been assigned to areas a safe distance from the National Capital Region years earlier. Ten-digit dialling became mandatory in both area codes, 819 and 613, on October 21, 2006, and exchange protection was largely ended. Seven-digit local calls in centres far from the area code boundary (such as Trois-Rivières or Belleville, with no local calling into any other area code at the time) were failing with intercept messages demanding customers to "dial the area code." The only legacy of the old system is a "dual dialability" scheme for federal government numbers in the National Capital Region. All federal government offices on the Quebec side have duplicated their entire allocation of multiple exchanges worth of numbers available on the Ontario side. Originally to be introduced in 2015, the CRTC on July 20, 2011 moved up the introduction of the new area code 873 to September 15, 2012 after a report stated that the current area code 819 would be exhausted by then. Area code 873 had never been assigned as a local exchange in 1-819 because the tiny border village Beebe Plain is divided between 1-819-876 Rock Island and 1-802-873 Derby Line, an international local call that had been given exchange code protection to permit seven-digit local dialling. There is still no number pooling in Canada, and redundant telephone exchange rate centres are not merged when the underlying municipalities are amalgamated.