Where is telephone country code 666?

Answer 1

There is no area code 666 in North America (USA, Canada, etc.; country code +1) or in Mexico (country code +52). Other countries may have a domestic area code 666 or similar.

There is no telephone country code +666, but country code +66 is Thailand, and there are some Thai VoIP numbers beginning with +66 6.

(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.)

Answer 2

Telephone country code +66 is Thailand. A number beginning with +66 6 is a Thai VoIP number.

(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.)