Updates on Apple’s IOS9 included a free 90-day music service.  After your trial, your account will be charged $9.95/month.  Information on unsubscribing from the services may be found here:

https://support.apple.com/en-us/HT202039

IOS9 also enables WIFI-Assist by default, which utilizes your LTE connection if you have a weak WIFI signal.  Information on turning off WIFI-Assist may be found here:

http://reviews.gizmodo.com/ios-9s-wi-fi-assist-is-eating-my-cell-data-1733513159