Gamifier sends personal and team notifications, that depends on the intercepted action in your connector. These notifications are send via push notification in your app, or via email.
Go to the notifications tab in your application, in the upper right corner you will find the “mark as read” icon. Just press this icon and all unread notifications will be marked as read. Check an example in the following image.
Yes, but this is a configuration of the operating system of your device.