I just want to open phone call application of android device. I dont want to provide that application a phone number. Just want to open it.  
 I am using phone application's package name to open it. Because I am able to open any application I want through that package name with the code below.  

`Intent launchIntent = getPackageManager().getLaunchIntentForPackage("com.android.contacts");
 startActivity(launchIntent);`  

I am not able to open **Phone** and **Contacts** application with the above code. What can be the problem?