Country code +999 (dialed as 00 999 from many places) is unassigned. It is reserved for some unspecified future global telecommunications service(s).
(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.)
Country code +990 is unused/invalid.
(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.)
Telephone country codes never begin with zero.
Country code +599, dialed as 00 599 from many places, is used by the Dutch Caribbean islands of Curaçao, Bonaire, Sint Eustatius, and Saba. (Sint Maarten used to also use +599, but now uses +1 721.)
Country code +99, dialed as 005 99 from many places, is an incomplete code somewhere in Asia. You need one more digit to specify the country.
To avoid confusion, it is best to write an international telephone number in correct international format, beginning with the plus symbol and the correct telephone country code (e.g., +599 or +995), omitting any dialing prefix.
(The plus signmeans "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.)
Leichtenstein is telephone country code +423.
where is telephone country code 1816
That is not a country code.
The country code and area code of Kalamayi- XJ, China is 86, (0)990.
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.
There is no area code +1 990 in North America (USA, Canada, etc.). North American area codes cannot have '9' as the middle digit.There is also no area code 990 in Mexico.There is no international telephone country code +990, nor any valid international telephone numbers beginning with +990.(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.)
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.