What area telephone code is 477?

There is no area code +1 477 in North America (USA, Canada, etc.).

International country code +47 is Norway.

Mexican area code +52 477 (and for mobiles +52 1 477) is for part of the state of Guanajuato, including Léon.

Other countries may have an area code 477.

(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, and many other countries use different prefixes.)