title: AT+CPMS "SM" Storage
body: <p>AT+CPMS? query to a SIM returns </p>
  
  <p><code>+CPMS: "SM",0,60, "SM,0,60,"SM",0,60</code>   </p>
  
  <pre><code>OK
  </code></pre>
  
  <p>The total storage is 60 messages maximum, and 0 are currently stored.<br>
  All messages are stored on the SIM.   </p>
  
  <p>An existing legacy application fails when trying to populate all 60 message boxes because message box 55 is the last successful write location.   </p>
  
  <p>When trying to populate the spaces 56-60, the command returns <code>CMS Error 322</code> which is a memory full error.   </p>
  
  <p>The text in each SMS is simply "P H" which is 3 ASCII bytes, so each text doesn't use an excessive amount of memory.   </p>
  
  <p>Has anyone an explanation why the spaces 56-60 are unavailable, although the CPMS? query shows them as available? Thanks.</p>