Telephone country codes never begin with zero.
Telephone country code +94, dialed as 00 94 from many places, is Sri Lanka.
Telephone country code +4, dialed as 009 4 from many places, is an incomplete code somewhere in Europe. You need one or two more digits to narrow it down to a particular country.
To reduce the possibility for confusion, it is best to quote an international telephone number beginning with the single plus symbol and the correct country code (e.g., +94 or +423), 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.
There is no 909 country code.
There is no telephone country code +897, nor +89, nor any other country code beginning with +89. There are no valid telephone numbers beginning with +89.
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.