Area codes 306 and 639 are telephone area codes in the North American Numbering Plan (NANP) for the entire Canadian province of Saskatchewan. 306 is the original area code, while 639 was added to create an overlay plan for the entire province. The incumbent local exchange carrier is SaskTel. Area code 306 is one of the original North American area codes that were assigned in 1947 in the contiguous United States and the then-nine-province extent of Canada. Saskatchewan's second area code, 639, was introduced in 2012.