title: Twilio SMS to Phone Num w/ Letters Spawns new Conversation - Workaround?
body: <p>Not sure if this is addressable, but here is my issue:</p>
  
  <ol>
  <li>User sends text to 310-333-ABCD ( &lt;-- not real)</li>
  <li><a href="https://www.twilio.com/docs/api/twiml/sms/your_response" rel="nofollow">My app responds</a> via twilio with the "To" number as the "From" number</li>
  <li>The phone gets the reply, but it spins up a new conversation thread from 310-333-2223 (&lt;-- letters converted to numbers)</li>
  </ol>
  
  <p>My problem lies in step 3.  I really need a way for this to stay in the same thread.  I've looked at cookies, but it doesn't seem there's a way to force a conversation to stay in the same thread.</p>
  
  <p>Bonus points:  If the number could retain the letter format (310-333-ABCD) in the outbound SMS somehow, that would be amazing.  I understand that this is probably a translation happening within the phone or at the carrier, but if it's happening at Twilio, it would be amazing to have this for branding/ease-of-use.</p>