026 appears to be a telephone area code, written in domestic format. It is impossible to know where it is without knowing what country you're asking about.
There is no telephone country code 025, because country codes never begin with zero.
Country codes beginning with +25 are in Africa, but you need one more digit; see the related question.
There are several countries that have domestic area codes 025 or similar. For example, within Hungary, 025 is the area code for Dunaújváros. There is no telephone country code 025, in part because telephone country codes cannot begin with zero. Country codes beginning with +25 are in Africa, but you need one more digit. See the related question.
Telephone country code +93 is Afghanistan, and area code +93 25 (Afghan domestic telephone area code 025) is the city of Logar, south of Kabul.
The telephone country code for Vietnam is +84. The area code for Lang Son is 025, or +84 25 in international format.
The telephone country code for Zimbabwe is +263. The area codes for Rusape are 025 (4-digit local numbers) and 0225 (7-digit local numbers), or +263 25 and +263 225 in international format.
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.