Check Your Permissions
There are a lot of apps out there that want access to your data. And while some of them have valid reasons for retaining access to it, that doesn’t mean you have to stand for every app on your iPhone harvesting your data. So you should check your permissions.
Most notably, you should cut down on the number of apps that can access your Microphone or Camera. It’s a good idea to do the same for Location Services, Bluetooth, Contacts and other features. You can do all of this by heading to Settings > Privacy on your device.