I was just on a call and used my phone to conference two calls together using the "Merge calls" button. When I was done with the conference call, I went to separate the calls by using the Private button but it didn't work correctly. When I hit private, it brought up a screen that asked me to choose the call I wanted to take private, but when I pressed the number it still remained in a conference. I couldn't separate the calls back to two individual calls. I know I had used the functionality back in the day on my old Dell Venue Pro running WP7, but now it doesn't seem to work correctly on my Nokia Lumia 925. Any ideas?