Telephone country code 1 is the country code for the United States and Canada. The area code 403 specifically corresponds to the southern part of the Canadian province of Alberta, including cities such as Calgary and Lethbridge. This area code is used for landline and mobile phone numbers in this region.
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00 isn't part of the country code, it is a commonly used international access prefix.
Country code +1 is North America (USA, Canada, etc.).
Area code +1 403 is the southern part of the province of Alberta, including Calgary, Alberta, Canada.
(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.)
Telephone country code +1 is North America, including the USA, Canada, and various Caribbean/nearby islands. Telephone area code +1 403 serves the southern part of Alberta, Canada, including Calgary.
(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 Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)