java - Launching an Android application from within app -

to launch android application use below code works fine every application installed on phone except "phone" application itself. when attempt launch "phone" app not launced , no error message or displayed or exception thrown.

this code i'm using launch application :

launchapp(context, packagemanager, "com.android.phone");  /*  * launch application  *   * @param c context of application  *   * @param pm related package manager of context  *   * @param pkgname name of package run  */ public static boolean launchapp(context c, packagemanager pm, string pkgname) {     // query intent lauching     intent intent = pm.getlaunchintentforpackage(pkgname);     // if intent available     if (intent != null) {         try {             // launch application             c.startactivity(intent);             // if succeed             return true;              // if fail         } catch (activitynotfoundexception ex) {             // quick message notification             toast toast = toast.maketext(c, "application not found",                     toast.length_long);             // display message             toast.show();         }     }     // default, fail launch     return false; } 

is correct method use launching android application and/or "phone" app special case not allow other applications launch/use ?

try code:

intent intent = new intent(intent.action_dial);  startactivity(intent);