title: Send Unicode (USC2) SMS with AT commands
body: <p>I am trying to send Unicode SMS using at commands and USC2 encoding. But it doesn't work, as I get errors. Here is my inputs:</p>
  
  <pre><code>AT
  OK
  AT+CSCS = ? 
  +CSCS: ("IRA","GSM","UCS2")
  AT+CSCS="UCS2"
  OK
  AT+CMGF=1
  OK
  AT+CSMP=1,167,0,8 //So this one doesnt work, let's try with 17,167,0,8
  ERROR
  
  AT+CSMP=17,167,0,8
  OK
  AT+CMGS="+370********"
  ERROR
  </code></pre>
  
  <p>Or maybe I should use PDU mode to achieve this?</p>
  
  <p>I have tried using older modem, and USC2 works in that one, however not in one im using. But im sure this conflicting modem supports USC2.</p>