title: Receiving spam from AWS SMS short code
body: <p>I've been using AWS SNS to send SMS short codes, which I have been able to do successfully (The short code I receive AWS SMS messages from is 37083). However, I noticed that if I respond to any of these messages, I get spam back.</p>
  
  <p>AWS SNS does not provide two way communication, but if I respond to the short code 37083 "STOP" I receive spam back. I received the following message:</p>
  
  <blockquote>
    <p>You are unsubscribed from alerts. No more messages will be sent. Reply HELP for help, email help@smshelps.com or 1-xxx-xxx-xxxx.</p>
  </blockquote>
  
  <p>This seemed odd, so I replied "HELP" and got the folloiwng message back:</p>
  
  <blockquote>
    <p>For Daily Job Match Alerts: Help email Support@smshelps.com or 1-xxx-xxx-xxxx. Msg and data rates may apply. text STOP to cancel. 3 msgs/week****</p>
  </blockquote>
  
  <p><strong>If AWS doesn't support two way communication, who/which provider is responding and why are we getting this spam?</strong></p>
  
  <p>I understand that we are using a shared short code, but aren't the pooled AWS short codes only shared by AWS users? Clearly this one seems to becoming from a different provider.</p>
  
  <p>I dug a bit deeper and found that the <a href="https://usshortcodedirectory.com/directory/short-code-37083/" rel="nofollow noreferrer">short code 37083 is leased to amazon</a> and no one else. I also found a <a href="https://usshortcodedirectory.com/directory/?fwp_short_code_search=amazon" rel="nofollow noreferrer">list of Amazon Short codes</a>. I tried sending "HELP" to some of the other Amazon short codes and did receive messages back, such as following message when I sent "HELP" to 58988 (58988 is a shared short code leased by Amazon)</p>
  
  <blockquote>
    <p>Where is my Truck. Delivery alerts. Recurring messages...</p>
  </blockquote>
  
  <p>Is there some other provider that is also leasing the same short code? My understanding was that only one provider leases a short code at a time. That provider then managers that shared short code and shares it with users.</p>