I just started seeing a Data Usage Notification (an exclamation point in a triangle). If I slide on it, it goes to Settings > Data Usage. I've used about 2/3 my alotted data (which is 3G per billing period).
From reading about it, the only way to get rid of the icon is to slide the top line on a graph that appears. This doesn't work for me, and it might only work for people who have unlimited data. Is there no other way to get rid of the warning icon?
My previous phone would never warn me about data usage with an icon. I received a text and email saying I was nearing the limit. The new phone (Android 5.1 on an Moto E) shouldn't continuously display that warning icon, it's annoying.
There is an app called Clear Notifications, should I try it?