I've read on a couple of forms where people have had the issue of their phone randomly rebooting and starting up to a lock screen that reads (something like):

Secure startup 1/25 attempts

If you use a pattern code to lock your phone, the pin number will be the digits that you're pattern lock follows.

I don't know how else to word it.

  Say your pattern followed the corners to 7391, your secure startup pin would be 7536951 So if you use a very complex pattern, it will just be every digit used that the pattern follows.

The attached visual reference would be 1598753

I've read on a couple of forums where people have had the issue of their phone randomly rebooting and starting up to a lock screen that reads (something like):

Secure startup 1/25 attempts

If you use a pattern code to unlock your phone, the PIN number will be the digits that your pattern lock follows.

I don't know how else to word it. Say, your pattern followed the corners to 7391, then your secure startup PIN would be 7536951. So, if you use a very complex pattern, it will just be every digit used that the pattern follows.

The attached visual reference would be 1598753.