iPhone "system services" using excessive mobile data
I try to look for answer in old discussion, don't think there is a conclusive answer. My iPhone using excessive mobile data with "system services". Like 300Mb in 7 days.
Before you say anything else, the following is status of things may be using data
iPhone 6
10.2.1
Apps using mobile data, only 2 app
Notification: all have been turned off
Background App Refresh: turned off
Itunes & app stores: signed off
iCloud: signed on (on previous test it was off but did not help
I would understand if certain app used data as it will be shown on the system then I can control my usage accordingly. My main concern is why "system services" use so much data in particular "iTunes accounts"??? Am I alone?
Regards
Larry
iPhone 6, iOS 10.2.1