Where is area 855?

Answer 1

North American (USA, Canada, etc.) area code +1 855 is a toll-free prefix, just like the more familiar +1 800.

Telephone country code +855 is Cambodia.

(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.)