That's true. I wonder, are you on Do Not Disturb mode? If you are, then please press volume key > volume bar will show up with bell icon beside it, tap the bell icon > choose All. Let me know if that works for you.
On most phones recently received messages appears on the screen and is the first thing you see when you turn your phone on. To see if you have a text message on a Doro phone it seems you have to tap on the messages icon to find it. Is that right?