title: AT+CUSD Not Working on modem Huawei e3131a
body: <p>I am trying to send at commands to get balance on huawei e3131a modem but i always receive "Ok" as answer no matter the configuration i use (GSM, IRA, UCS2). I also tried to change the operator code (<code>#123#</code>) to many formats like Hex PDU Simple String but no way to get the balance.
  Here is the command i sent : 
  <code>AT+CUSD=1,"#123#",15</code>.
  Thanks in advance for the help. </p>
  
  <p>NB: I am using Putty to send commands.</p>