Have you tried restarting the phone in Safe Mode if just restarting didn't fix it?
If that doesn't work, we need the make and model of your phone to give you a link to what to do next. And please register an account here so that you don't have to start a new conversation and repeat all this in it so people know what you're talking about. "It didn't work, it's an X model Y phone" isn't going to give anyone any information.