This is my previous main phone. It has no SIM installed.It was fully charged and definitely powered off. Had been for a week. I came home from work to find it lit up and running. I checked the battery history and it had been up for 2 hours 45 minutes. There was definitely nobody around at the time indicated who could have powered it up. Can these (or any) phones power on by themselves? I guess I can prevent it by removing the battery but I am puzzled. It has never done this before in the 3 years I have had it.