That depends on your international access prefix.
If your international access prefix is 00 (the most commonly used), then you are asking about telephone country code +1 (North America = USA, Canada, and certain Caribbean/nearby islands), area code 473 (the Caribbean island nation of Grenada).
However, if your international access prefix is 001, then you're asking about telephone country code +47, which is Norway.
Lastly, if your international access prefix is 0014, then you're asking about telephone country code +7, which is Russia and Kazakhstan. A number beginning with +7 34 is a landline in Russia.
To avoid the confusion of different access prefixes used around the world, it is best to quote an international telephone number beginning with the single plus symbol and the correct telephone country code. Note that telephone country codes never begin with zero.
(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.)
Leichtenstein is telephone country code +423.
where is telephone country code 1816
That is not a country code.
Fiji has telephone country code +679.
Country code +57 is Colombia.
Gibraltar is country code +350.
Moldova is country code +373.
Slovenia is country code +386.
Vanuatu is country code +678.
Niue is country code +683.
Togo is country code +228.
Liberia is country code +231.