title: Okta API: SMS Multi-factor Issue
body: <p>I'm attempting to use the Okta API in a web application to allow users to activate/deactivate a SMS MFA factor on their accounts.  However, I'm running into an issue as detailed below:</p>
  
  <p>First, on a newly created account:</p>
  
  <ol>
  <li>An SMS factor is enrolled via the <a href="http://developer.okta.com/docs/api/resources/factors.html#enroll-okta-sms-factor" rel="nofollow">Enroll Okta SMS Factor</a> API method.</li>
  <li>This factor is subsequently activated via the <a href="http://developer.okta.com/docs/api/resources/factors.html#activate-sms-factor" rel="nofollow">Acivate SMS Factor</a> API
  method.</li>
  <li>Then we deactivate the factor using the <a href="http://developer.okta.com/docs/api/resources/factors.html#reset-factor" rel="nofollow">Reset Factor API</a>
  method.</li>
  </ol>
  
  <p>All of this works fine and without errors, however, now when trying to enroll a SMS factor again:</p>
  
  <ul>
  <li>If using the same phone number: No security code will be sent and SMS
  two-factor auth will be enabled without requiring verification (this
  is okay but unexpected)</li>
  <li><p>If using a different phone number: Okta returns the following error object:</p>
  
  <pre><code>stdClass Object
  (
      [errorCode] =&gt; E0000001
      [errorSummary] =&gt; Api validation failed: factorEnrollRequest
      [errorLink] =&gt; E0000001
      [errorId] =&gt; oae3MBJJpGrR6Oj_MkGOxed_g
      [errorCauses] =&gt; Array
          (
              [0] =&gt; stdClass Object
                  (
                      [errorSummary] =&gt; There is an existing verified phone number.
                  )
          )
  )
  </code></pre></li>
  </ul>
  
  <p>How can I resolve this issue?  Am I missing a step where I have to remove a previously verified phone number? If so, how do I do that?</p>