According to the UN web site, it's an unused area code for south-Central Asia.
http://unstats.un.org/unsd/methods/m49/m49chang.htm
From what I can tell, it's scammers calling to get credit card information.
The telephone country code for Zimbabwe is +263. The area code for Norton is 062, or +263 62 in international format.
The telephone country code for Vietnam is +84. The area code for Binh Thuan is 062, or +84 62 in international format.
Leichtenstein is telephone country code +423.
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.
Vanuatu is country code +678.
Niue is country code +683.