There is a long list of ethical rules that define etiquette for cyclists.
There is also a list that recumbent riders must adhere to and one of those rules is number 17.
To comply with rule 17, it is useful to have a smartphone with you …
But the other rules are also very useful to adhere to!

Long ago when my grandfather had a kind of velomobile made by the local bicycle repair shop (Kuypers in Vorden) there was no #rule17

And even longer ago (around 1917) it was already an exception that photos were taken during a bike ride at all, as my father has been captured here by an unknown photographer.