the 519/226/548 territory covers a wide area (over 36,000 km²), and no single municipality controlling a majority of the available numbers. in theory, therefore, the 226 overlay area code could have been introduced without breaking seven-digit dialing in any of the npa 519 communities. this would, however, have required exchange numbers to be issued in a specific pattern. for instance, if 519-999-9999 were a windsor number, the same number in the new area code, 226-999-9999, would have to be issued in london, guelph, or some other community that would never be a local call to any point in the windsor area.