my phone is off, but yesterday a green light was flashing in the upper left corner, and today it's a blue light flashing. There is nothing in the tutorial or the handbook to explain this.
I also get a screen that asks me to make an emergency call contact when I turn on the device. I don't know how to get out of this, and I only get the phone to work further by typing in a PIN.
The flashing lights are indicators or reminders, such as a missed call or you received a voice mail message.
If you don't want to use a PIN code every time you use your phone, you can change that in your system settings.