I am looking to find out what telephone company offers 800 service and can
supply the prefix of 4 2 4 - ? ? ? ?.

How do I find this company or other companies by the prefixes they
use.

Hello rick1,

Thank you for your question. 

I found your answer at a phrack page. Note, since the url uses
profanity, I have converted it to a tiny url for you:

http://tinyurl.com/77v3


"Special Area Codes   
            
by >Unknown User<      January 3, 1989             


Greetings!  I have compiled information about the SACs for your
edification; these include 700, 800, and 900...

...800 Service
~~~~~~~~~~~
800 service is offered by various IECs.  Each NXX in the 800 SAC is
assigned to a given carrier, who is responsible for assigning numbers
from that block to customers, and providing 10 digit translation..."

Scrolling further down the page we can find who has been issued this
block of numbers. You requested 800-424-xxxx

424 = ATX 

And the code key tells us: ATX = AT&T  


So this block of 800 numbers can be assigned by AT&T


Search Strategy:

"800 number" +prefix +424 +provider

I trust my research has provided you with the answer you desired. If a
link above should fail to work or anything require further explanation
or research, please do post a Request for Clarification prior to
rating the answer and closing the question and I will be pleased to
assist further.

Regards,

-=clouseau=-

Dear Clouseau,

Thanks sooooo much for your quick and complete answers.  That was the
best $10 I ever spent.  I never expected so much information for so
little money.  Rick

You are quite welcome, Rick.

Thank you so much for the kind rating and tip!

-=clouseau=-