437 is the new overlay area code for Toronto, Ontario, Canada, joining 416 and 647 in serving the city of Toronto. (The suburbs use 905, 289, and 365.)
No other location in the North American Numbering Plan (USA and Canada, plus 18 island nations and territories in or near the Caribbean) has ever used area code 437.
However, Mexico has an area code 437, serving Tlaltenango, Zacatecas, and nearby areas of northwestern Jalisco state. Other countries may have an area code 437.
Additionally, country code +43 is Austria, and there are numbers beginning with +43 7.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
There is no area code +1 922 in the US & Canada. Country code +92 is Pakistan.
Unless you have a calling plan that offers unlimited calls in the US and Canada, a call from area code 314 (in or near St. Louis, Missouri) to area code 905 (suburbs of Toronto, Canada), will be billed as an international toll call.
There is no area code 523 in North America (USA, Canada, etc.). International country code +52 is Mexico.
The country code and area code of Nova Scotia- Prince Edward Island, Canada is 1, (1+)902.
There is no area code 483 in North America (USA, Canada, etc.). International country code +48 is Poland.
Area code 647 is the city of Toronto, Ontario, Canada, in an overlay on area code 416.
In North America (USA, Canada, etc.), telephone area code +1 737 is an overlay on area code +1 512, serving part of central Texas including Austin.
No such area code in North America (telephone country code +1 = USA, Canada, etc.).
Newfoundland and Labrador in Canada
Area code 343 has been assigned in Canada, to overlay the 613 area code in Eastern Ontario. This area includes Ottawa
The area code for Stratford, Ontario, Canada is 519 or 226. (226 is an overlay of 519, serving the same geographic territory.)
Country code +1 is North America (USA, Canada, etc.), and +1 647 is one of the area codes for Toronto, Canada.