Telephone country codes never begin with zero.
Telephone country code +1, dialed as 00 1 from many places, is North America (USA, Canada, etc.). You need the next three digits, the area code, to narrow down the location any farther.
Telephone country code +9, dialed as 001 9 from many places, is an incomplete code in Asia, or possibly an international telephone service.
To reduce the possibility of confusion, it is best to quote an international telephone number beginning with the single plus symbol and the correct telephone country code, omitting any dialing prefix.
(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.