title: gammu check balance using getussd is encrypted
body: <p>i am in a developing message broadcast message.<br>
  i have a problem while to check balance.
  and the response is like :</p>
  
  <pre><code>Service reply        : "00500075006C007300610020003000200073002F006400200031004A
  0075006E00310033002E0020004700610075006C002000420075006C0061006E0061006E00200031
  002E003500470042002C005200700034003900720062002F0062006C006E002E0020004E00470045
  0042005500540026004D0055005200410048000A00310020004D00610075000A003200200049006E
  007400650072006E00650074002F00420042000A003300200050006B007400200053007500700065
  0072002000480065006D00610074000A003400200050006B00740020004E0065006C0070006F006E
  000A0035002000500072006F006D006F004B006F006E00740065006E000A00360020006D00500075
  006C00730061000A00370020004D00790049006E0066006F000A"
  </code></pre>
  
  <p>how to read(decrypt) it?</p>