Dutch area code 026 (or international +31 26) is Arnhem.
Country code +27 is South Africa. 027 or similar could also be a valid domestic telephone area code in several different countries.
The telephone country code for Vietnam is +84. The area code for Cao Bang is 026, or +84 26 in international format.
The country code and area code of Kroonstad, South Africa is 27, (0)56.
The country code and area code of Bisho, South Africa is 27, (0)40.
The country code and area code of Welkom, South Africa is 27, (0)57.
The country code and area code of Middelburg, South Africa is 27, (0)13.
The country code and area code of Ladysmith, South Africa is 27, (0)36.
The country code and area code of Bethlehem, South Africa is 27, (0)58.
The country code and area code of Ermelo, South Africa is 27, (0)17.
The country code and area code of Humansdorp, South Africa is 27, (0)42.
The country code and area code of Kimberley, South Africa is 27, (0)53.