I didn't know you could text back "Stop"
I sent an e-mail which & cc'd my e-mail address.  On my cc'd version of e-mail their email address for 254-34 appears as:  8005899900@yahoo.com
I googled the # 8005899900 & found the same complaints referenced on website.  Per that site  it's the # Info Svc @ (800) 921-6800 (however, I haven't checked that out). I did check out a website referenced:  
CHECK THIS WEBSITE FOR PROVIDER INFORMATION:
www.nusvc.com...
this website specifically references 254-34 & states the following:
Opt out by SMS ( the fastest way)
To opt out immediately please send STOP to 25434. Your number will be removed instantly and no future charges will apply
Opt out by email
You may also send an E-mail to service@numsvc.com, with Subject: Opt out request, listing your mobile phone number. This  E-mail opt-out process will take about one business day.
For additional customer service please call: 1-800-589-9900.

I don't know what it is but I looked up numsvc.com's registration and it's registered to a domain proxy in Portugal which means the real owner of the website does not want to be found. I advise staying away from it. Replying in any manner might result in a big charge to you on your phone bill.

i got the same thing what is this? is it a way to dial and cover porn? or is it a way to make calls and it not show up on the phone bill? ineed to know what this is

This number comes up after I enter "STOP & REMOVE" from a text message that read: "The # Info Svc, at 800-921-6800, has been renewed for another month! Support? www.numsvc.com".