Mauritius is country code +230. There are no area codes. The local number is 7 digits, except for mobile numbers which are 8 digits beginning with '5'.
(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 North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
The Maldives use country code +960. There are no city codes or area codes. All numbers are 7 digits after the country code.
Landlines in the Male region begin with +960 3. Landlines in the atolls begin with +960 6. Mobile numbers begin with +960 7 (Dhiraagu) or +960 9 (Wataniya Telecom).
There are also premium-rate numbers beginning with +960 900, followed by 7 additional digits.
Maldives is country code +960.
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.
Angola is country code +244.