I just got my new Google Pixel. Not sure if it is XL or not? It has 128GB. Anyway, I am using Handcent SMS (NextSMS). I went to notifications for Handcent and selected not to show on lock screen at all. But still, when my phone is locked and I get an SMS it displays and people can even respond. It is better people not respond nor see the SMS when the phone is locked. Any idea what else you need to do so the SMS won't show on your locked screen?