Who owns this 800 number?
800 number is a toll free number, it is also known for its other names such as Freecall, Freephone or 1-800 number. It is a special telephone number, in that the called party is charged the cost of the calls by the telephone carrier, instead of the calling party.
Who? What? You could at least wrote the 1800 numbers along with your question. But if you mean the prefix 800 number then SMS/800 maintains this and other prefixes such as 866, 877 and 888.