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
I just the Xperia phones weren’t ridiculous expensive. Why is it impossible to get all these features on a modern smartphone <$600 USD that’s not from a Chinese manufacturer?
I feel the best-of-both-worlds move nowadays is to get an iPhone SE and something like the Sony NW-A306. Just embrace a small dedicated media device, iOS for privacy but still getting to use the stupid iMessage and FaceTime features all of your asshole friends use, and an awesome DAP that you can install that one Android app you need for whatever reason.