Telephone country code +33 (dialed as 00 33or 011 33 from many places) is France. A number beginning with +33 6 or +33 7 is a mobile phone.
(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 337 is not assigned to any specific country. Country calling codes are typically assigned in the range of 1 to 999, with each country having its unique code or a range of codes. Therefore, it is likely that 337 is not currently in use or reserved for future assignment.
Honey, country code 337 doesn't exist in the telephone world. Maybe you meant 33 for France or 7 for Russia? But 337? That's as real as a unicorn riding a rainbow. Next question, please!
The telephone area code 337 covers southwestern Louisiana, including Lafayette and Lake Charles.
Leichtenstein is telephone country code +423.
where is telephone country code 1816
That is not a country code.
Gibraltar is country code +350.
Moldova is country code +373.
Slovenia is country code +386.
Togo is country code +228.
Liberia is country code +231.
Angola is country code +244.
Mozambique is country code +258.
Niue is country code +683.
Fiji has telephone country code +679.