title: Error( Failed to get SMSC number from phone) in python-gammu when sending sms
body: <p>I got this error in sending sms:
  gammu.ERR_GETTING_SMSC: {'Text': u'Failed to get SMSC number from phone.', 'Code': 69, 'Where': 'SendSMS'}</p>
  
  <p>Here is the code I use</p>
  
  <pre><code>import gammu
  
  sm = gammu.StateMachine()
  sm.ReadConfig()
  sm.Init()
  
  message = {
      'Text': 'python-gammu testing message', 
      'SMSC': {'Location': 1},
      'Number': '+###############',
  }
  
  sm.SendSMS(message)
  </code></pre>