For me its the ‘Knock Code’ that LG had on their phones (I really wish LG still made at least the V series phones)

Basically there was a four-square area and you set up a sequence of where you would tap to unlock the phone. That set of squares was only shown when you set up the code

Then, to unlock your phone, you would tap those areas in the sequence you set up (even with the screen off).

Fingerprint readers are nice, but I really do miss the knock code

Edit: did find this article with a way to do the knock code, but if done wrong, could brick your phone I guess.

Plus, article is from 2014. When I looked at XDA’s info on it (they also being the developers) it looks like development on it is over, but individual modules may or may not still be supported by their devs

  • 𝒎𝒂𝒏𝒊𝒆𝒍
    2•11 months ago

    I don’t understand that argument, power banks are widely accessible nowadays, you can charge your phone without downtime, also can’t imagine charging this additional battery, like shutting the phone down jest to charge the second one? I’m all for user replaceable batteries tho in case of battery degradation and prolonging device’s life