Space code 437 can be launched on March 25, 2013 as reduction for overlay complicated 416/647 masking town of Toronto, Ontario. The brand new space code will cowl the identical geographical space. Since 10 digit dialing is already mandatoty in current overlay complicated 416/647, no permissive interval is required and no adjustments wil be made in the way in which residents of town of Toronto dial phone calls.
See official announcement and map (PDF doc).
Go to area code 437 web page for an inventory of cities served, map and different information.