Should I let my iPhone trickle charge at 100%?

Some websites and apps are saying you should let your battery trickle charge at 100%, which means the percentage might say 100% but the unplug symbol isn't there yet, should I wait for that symbol to be there even though it's at 100%?

Doesn't matter
smartphones stop charging automatically when they are full.

Iphones dont have that issue, doesn't matter either way.