Plasma lockscreen is currently hard (or impossible) to unlock using phone itself
@minlexx outlined various problems with the plasma mobile lockscreen in !337 (comment 165728203):
- buttons are too small (see the photo in his post)
- no reaction to touch (see video in the post)
- passwords can only have numbers
- high CPU usage ("device overheats and drains battery from 100% to zero in 1 hour or less, even plugged to USB.", see htop screenshot from his post)
If somebody wants to work on this, please check the KDE bugtracker, and coordinate with the plasma mobile team. Just searching for appropriate upstream bugs and posting them here would already be helpful.
(CC: @bshah)