eight-hundred number

800 number

a toll-free telephone number preceded by the three-digit code “800,” used esp. by a business to receive orders from distant customers.
[1975–80, Amer.]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
I'll give you an eight-hundred number to call in case you have any questions.
I punch the eight-hundred number into my cell phone.
But I still have the eight-hundred number in my phone.