Wow great information. I had no idea, all three (PIN, wallet, & phone) need to be specific to unlock. BTW, what happens if I lose my phone (the one I used to scan the Jade QR)? I guess, I need to set it up again by restoring the wallet. Thank you so much, folks.
QR PIN Unlock adds more process to the setup as it requires several encryption and decryption settings, so as long as you have SeedQR you don't need to worry about losing your phone. It is a specialized mode against certain attacks, so if you do not know what you are doing, simply connect it via Bluetooth.