Area code 855 in the United States and Canada is not a real area code. No city has the area code 855. It is a prefix for toll free numbers.
People or businesses in any location can subscribe to this area code. The calls are free to the caller because the receiving party pays the long distance charges.
So the phone number (855-***-****) owner can be in any time zone. Other toll free prefixes include: 800, 888, 877, 833, 844, 855, 866.
While toll-free area codes such as 855 are used in both the United States and Canada, the owner of the toll free number may place restrictions on which calls to accept.
For example, if a business in the United States does not want to accept the fees for Canadian calls, they block Canadian numbers from connecting.
Calls to 855 and other toll-free area codes are not free to callers from outside North America.
855 area code can be used in any timezone. Usually, people buy toll free numbers through a service like Grasshopper, and the cost depends on the service provider.
More often than not, the cost of 855 number covers the service provider, the plan you choose, the minutes you use, and the actual number.
Mobile area codes: +855 1x or +855 9x as follows:
Area code Carrier/Service/Status ========= ====================== +855 10 : reserved +855 11 : Camshin (Shinawatra) DCS 1800 +855 12 : CamGSM +855 13 : reserved +855 14 : Camtel CDMA (reserved) +855 15 : Casacom (Samart) NMT 900 +855 16 : Casacom (Samart) GSM 900 +855 17 : reserved +855 18 : Camtel AMPS +855 19 : reserved +855 90 : reserved +855 91 : MPTC TLMRS (Trunked Land Mobile Radio) +855 92 : Mobitel Tango service +855 93 : reserved +855 94 : maritime radio +855 95 : national paging service +855 96-99 : reserved