Suriname (Dutch Guyana) is country code +597.
Guyana is country code +592.
French Guiana is country code +594.
(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 country code and area code of West Suriname, Suriname is 597, (0)2.
The country code and area code of Central and East Suriname, Suriname is 597, (0)3.
The country code and area code of Paramaribo, Suriname is 597, (0)4.
Leichtenstein is telephone country code +423.
Suriname's abbreviation is SR. This abbreviation is used in Suriname's world airport code. It also is the Internet country-code top-level domain [ccTLD].
where is telephone country code 1816
That is not a country code.
Fiji has telephone country code +679.
Country code +57 is Colombia.
Gibraltar is country code +350.
Moldova is country code +373.
Slovenia is country code +386.