Message issues
Recently I've been having problem with my messages. Now, when I open my messages app, the screen will freeze, and after about 10 seconds it prompts me to start a new message, but I can't type in any contacts or send any texts. When I press cancel on that it brings me to the normal texting app, but none of my messages show up. When this happens I can't receive any messages either (I've tested this by sending myself texts from other people's phones). Also, when I try to click on the iMessage settings, it freezes my screen until I leave the settings app. I can't make phone calls or FaceTime either. Does anyone know what the problem can be before I give up and take it to the Apple Store?
iPhone 5, iOS 8.4