Share your experience!
As above, when my screen locks a video plays. This is whether charging or not. I cannot get it to stop playing this video. Also, when I try to set up a PIN for my phone. A padlock appears over the number pad. I have also tried then to set up a swipe lock. The number pad again gets blocked by a Padlock.
Any help will be much appreciated.
Solved! Go to Solution.
Did you purchased a retail demo phone?
check this out
http://talk.sonymobile.com/t5/Xperia-Z3-Compact/Removing-retail-demo/m-p/844453/highlight/true#M370
No I purchased a normal phone as far as I can tell. It was fresh out of the box and everything. I might have to take it back to them however. 
Just a question,have you tried to dial *#*#73556673#*#*?
Sorry it took so long for my reply. I have been busy at home. I had a demo phone. Took it back to Carphone Warehouse and they replaced it for me. All sorted.
Nice to know.