Country code +229 (dialed as 00 229 from many places) is Benin.
Landline numbers begin with +229 2.
Mobile numbers begin with +229 9.
(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.)
Vanuatu is country code +678.
There are many countries with domestic telephone area code 052 or similar. It is impossible to say which one you're asking about.
Leichtenstein is telephone country code +423.
where is telephone country code 1816
That is not a country code.
There is no area code 678 in Mexico.
Country code +57 is Colombia.
Country code 52 is Mexico.
Fiji has telephone country code +679.
Gibraltar is country code +350.
Moldova is country code +373.
Slovenia is country code +386.