By the way, slight security flaw you should all be aware of.
Basically by default you can access Siri and/or Control Center from Lock Screen.
Which is terribly convenient, but does mean that if someone nicks your phone they can easily switch on Airplane Mode, without having to unlock the phone, thus effectively disabling "Find My iPhone".
If that's a worry you might want to change those defaults!
Settings, Control Centre Access On Lock Screen fixes that