My new G4 replacement phone is not notifying me when a text comes in.

[kfnflfan]

Verizon recently sent me a new G4 because my old one would not open wifi or bluetooth. Now I do not receive any notifications when a text message comes in and the phone is in sleep mode. On the old phone, I'd see a pop-up window that told me a text had been received, but not with this phone. I think I've adjusted everything I need in the settings, but still nothing.