Merge "Do not mark as read if it already is."

            public Void doInBackground(Void... params) {

                ContentValues values = new ContentValues();

                values.put(Voicemails.IS_READ, true);

                getContentResolver().update(voicemailUri, values, null, null);

                getContentResolver().update(voicemailUri, values,

                        Voicemails.IS_READ + " = 0", null);

                return null;

            }

        });