Chad uses telephone country code +235. To write a mobile number in Chad in international format, just put +235 in front of the domestic number.
The country code and area code of Farcha, Chad is 235, 252.
The country code and area code of Goudji, Chad is 235, 251.
The country code and area code of Batha, Chad is 235, 250.
The country code and area code of Hadjer Lamis, Chad is 235, 254.
The country code and area code of Logone Oriental, Chad is 235, 269.
The country code and area code of Moyen Chari, Chad is 235, 268.
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.