I am unable to turn off mobile data for some apps. Facebook, Cotap, Youtube and some others. Yet some of the apps I can turn mobile data off for e.g App Store.
I recently upgraded to 8.4.1 on my iPhone 4s.
Any one have any ideas?
There's a bug which occurs sometimes where the CellularData.db is corrupted/malformed and iOS can't write the preferences to it.
You can fix this by deleting the file, located in
Sounds like a bug in iOS to me. The best thing that you can do is wait until iOS 9 launches in a couple of weeks. iOS 9 should address many bugs and improve the performance of your iPhone, (even a 4S) so I highly recommend updating when iOS 9 gets a public release.