Im sorry for asking a question with my first post but i have searched and can't find anything. Im aware its probably super simple but i can't seem to get my head around it. I have set my text tone to Guitar 2 & set my profile to normal and have the sound up as far as it can go. My issue is that if the phone is on stand by and the screen is black, when i get a text there is no noise? Sometimes when a text comes through the phone vibrates and makes the noise but the majority of the time its just silent. Should the screen light up when i get a new message and make a noise or vibrate?