I used the always-on-feature of freedome because of the issue it had with whatsapp/threema and other apps that use notifications.
Can I now switch back to the on-demand connection in iOS10? So that I don't need the always connected feature?
As mentioned in this KB article, it is recommended to upgrade the iOS to 9.30 or later. Apple fixed an issue in this iOS version which caused these kinds of problems in various apps.