Country code +38 is the Socialist Federal Republic of Yugoslavia. Since Yugoslavia is no longer a country, there are now several countries with country codes in the range of +380 to +389.
+380 = Ukraine
+381 = Serbia*
+382 = Montenegro*
+385 = Croatia*
+386 = Slovenia*
+387 = Bosnia and Herzegovina*
+388 = (was pan-European numbers; assignment withdrawn)
+389 = Republic of Macedonia*
The countries marked with asterisks were part of Yugoslavia.
The telephone country code for Vietnam is +84. The area code for Nghe An is 038, or +84 38 in international format.
Leichtenstein is telephone country code +423.
where is telephone country code 1816
That is not a country code.
The country code for Paraguay is +595, and the area code for Bella Vista Norte is 038, which is +595 38 in international format.
Country code +57 is Colombia.
Country code 52 is Mexico.
Fiji has telephone country code +679.
Gibraltar is country code +350.
Moldova is country code +373.
Slovenia is country code +386.
Vanuatu is country code +678.