Calling a USSD number without opening the phone app in Android -

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I am trying to call a USSD number from my application: 

  = Uri.fromParts ("tel", "* 110 #", ""); Int'l I = new intent (int. Action_CALL, U); StartActivity (i);   
 This phone launches the app and calls the number.  
 What do I need to call the USSD number without opening the phone app or  please open it in the background.   
 If the user is doing something, then he should not bother. Only one notification should be generated.  
  Any suggestions?    
 
 
 Fortunately, this is not possible, except for your own custom firmware If this is possible, then malware will take advantage of it to make a phone call without the user's knowledge.

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