If you play with it enough, it will unlock. It is a combination of a timely double click of the main button in the emergency call or ICE screen. My 1 year unlocked my phone and she definitely doesn't know the code. I was able to duplicate what she does but not 100% sure how to explain it. I can do it now almost everytime on my phone or anyone else's Samsung Galaxy S7. My security settings are set on the pattern and my phone is T-Mobile stock and fully updated
Steps: 1. Lock the device with a "secure" pattern, PIN, or password. 2. Activate the screen. 3. Press "Emergency Call". 4. Press the "ICE" button on the bottom left. 5. Hold down the physical home key for a few seconds and then release. 6. The phone's home screen will be displayed - briefly.