1783503506 replied at 2018-09-14 11:03:06
i have not got it.on idependence day i did not get it.how to change it??

You should have an app which is password protected... you can use Security centre  App lock for putting a lock on some apps like whatsApp, Gallery etc.
Next time you should be able to see such Greeting images on app lock screen.

Second reason could be that there are few devices which we have not included in this trial. Example: All the devices which have big screen are not included in this trial. They are under testing.
Hope it helps. Thanks.