Nobody would adopt them. It&#x27;s annoying enough to deal with 4 digits when it&#x27;s cold and I&#x27;m wearing gloves and I just want to change the song I&#x27;m listening to.<p>Passphrases suck enough whenever you have to log back in. Are people really gonna put up with that <i>every time they want to use their phone?</i><p>On the other hand, if there were a convenient way to <i>toggle</i> between passphrases and 4-digit unlock, (especially if you had to use the passphrases to toggle back to 4-digit) then I would be all for it.