Here is an odd thing.
I bought my Note 3 unlocked from Amazon before XMAS. It is still on 4.3
My dad liked the phone so he got one too not long after also unlocked from Amazon.
I noticed on his lock screen the other day there was a camera icon. I checked his phone and it's on 4.4.2.
He was trying to play recordings of phone calls and noticed it just recorded a hiss. I remember someone saying in another thread that Kitkat stopped you recording calls. This is what made me check the OS version.
He has an O2 sim and I have a GiffGaff Sim. If I check for updates there are none for my phone, his phone must have updated itself recently because it had been recording calls fine.
Is it possible to downgrade to 4.3?
For anyone interested this is what his phone shows.
https://dl.dropboxusercontent.com/u/21046157/kitkat.jpg