TORONTO -- Make way for the 437 in the 416/647.

New area codes are being introduced in the GTA starting March 25 due to increasing demand for telephone numbers, particularly for wireless devices.

In Toronto, where 416 and 647 area codes are used, 437 will be added.

The 905/289 area -- which covers southern Ontario, including Ajax-Pickering, Brampton, Burlington, Hamilton, Markham, Milton, Mississauga, Oakville, Oshawa, Richmond Hill, St. Catharines and Whitby -- will be joined by area code 365.

The introduction of a new area code in a region does not affect the local calling areas or the way local or long-distance calls are dialled. Special numbers like 911 will still be dialled using only three digits.