There is no telephone country code +178. Country code +1 is North America (USA, Canada, etc.), and 78 would be the first two digits of a three-digit area code.
(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 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.
Oh, what a happy little question! Area code 178 isn't assigned to any specific country at the moment. But that's okay, because sometimes things change, and new numbers are added all the time. Just like in painting, we can always add more colors to make our world a little brighter.
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.
Vanuatu is country code +678.
Niue is country code +683.