Pop up asked to change passcode
Woke my iPhone and a pop up asked that I must change my passcode in 60 minutes. There was later or change, and then emergency or change options. When I did change I originally had a 6 digit and now it changed to a 4 digit. After this I changed back to a 6 digit though.
I'm a little nervous though why this came up, was it a hack/virus or whatever? My iPhone 6 plus is stock, never jailbroken etc on latest iOS v9.2. Can someone tell and put my mind at rest please, was this from Apple?
Thanks