Why is Coverage Maps saying “Provider Unknown”?

If you’re screen looks similar to this:

It is likely that we cannot identify your provider. Coverage Maps only maps coverage for cellular providers. When you are connected to Wi-Fi, we don’t identify your cellular provider, but you can still use Coverage Maps by sliding up the drawer and picking any Top Provider in the area.

If you don’t see your provider listed, disconnect from Wi-Fi and we will be able to identify your cellular provider and properly map their coverage data.