Time & Location - High data usage iPhone 5s running iOS 8.0.2

I am on a 2GB/month plan so I tend to keep a close eye on cellular data usage. Recently noticed that Settings > Cellular > System Services > Time &amp; Location was almost 300MB in about 20 days. In the past, I have never seen this more than 3-5MB. Checked a friend who has the same hardware &amp; software and his usage has remained under 10MB/month.

What accounts for this high usage? I have background refresh turned off, Location Services enabled only for GPS apps (e.g. Waze cellular usage is around 30MB) and Find My Phone.

What exactly does "Time and Location" mean, which system components use this service and why has the usage shot up 100 times from 3MB to almost 300MB?

Thanks
I know this question is old, but I just found the the same happening for me.

First off, you can see when your location services are currently in use when a little North-East arrow appears on your status bar next to your battery.

One way to find out which apps are using location services, is to start closing apps one by one and checking when that arrow disappears.

A better way is to look at the Location Services settings Settings &gt; Privacy &gt; Location Services. Here you can see all the apps that have requested access to Location Services and also what permission they have been granted ("Never", "While Using" or "Always"). Best pay special attention to the apps that show "Always". This means they can use Location Services even when the app is not active. This screen will also show a purple North East arrow next to apps that are actively using Location Services right now.

If you don't want the offending apps to have access to Location Services you can change their access to "Never" or "While Using" to limit the damage. Note though that depending on the apps purpose it might stop performing as desired.