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Your code does not match the Java equivalent that has been sent to you. This is the equivalent: uses Androidapi.JNI.GraphicsContentViewText, Androidapi.JNI.Net, Androidapi.Helpers; procedure TForm1.Button1Click(Sender: TObject); var MobileNumber: string; Intent: JIntent; begin MobileNumber := '*155#'; Intent := TJIntent.JavaClass.init(TJIntent.JavaClass.ACTION_CALL); Intent.putExtra(StringToJString('com.android.phone.extra.slot'), 1); Intent.putExtra(StringToJString('simSlot'), 1); Intent.setData(TJnet_Uri.JavaClass.parse(StringtoJString('tel:' + MobileNumber))); TAndroidHelper.Context.startActivity(Intent); end; I don't have a dual SIM device to test this. Those are not equivalent. TJIntent.JavaClass.EXTRA_PHONE_NUMBER is "android.intent.extra.PHONE_NUMBER", not "com.android.phone.extra.slot"

Run the batch file in the images folder first.