Telephone country codes never begin with zero, and there is no country code +77. Country code +7 is Russia and Kazakhstan, and a number beginning with +7 7xx is in Kazakhstan. See the related question for more information.
That is not a country code.
No such code.
The telephone country code for Vietnam is +84. The area code for Bac Giang is 0240, or +84 240 in international format.
The code 007 is used to dial out of the countries Cambodia, Colombia, and Indonesia.
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.