title: backup full sms/mms contents via adb
body: <p>I've been attempting to use adb to pull the sms/mms inbox in its entirety from the device but am having some trouble. The phone is rooted and I've tried the following commands:</p>
  
  <p>Input</p>
  
  <pre><code>./adb pull /data/data/com.android.providers.telephony/databases/mmssms.db
  </code></pre>
  
  <p>output</p>
  
  <pre><code>Permission denied
  </code></pre>
  
  <p>Input </p>
  
  <pre><code>./adb pull su /data/data/com.android.providers.telephony/databases/mmssms.db
  </code></pre>
  
  <p>Output</p>
  
  <pre><code>The help menu
  </code></pre>
  
  <p>Am I flawed in my thinking that I can pull the sms inbox via commands similar to the ones I've tried? If it can be done what is wrong with my command?</p>
  
  <p>Thanks</p>