Hi all,
As far as i can tell with the limited usage i had, it works! (For me, that is)
All the discussion here led me to make a little cover with penholder and a place to stick a small pack of post-it notes. So getting a call on a scaffolding, after i finish the call, i whip out that "booklet", make a note and put the post-it on the opposing side inside the cover. Making it a notepad and an in-box at the same time. When evening comes, i take out the used post-its and process them.
Its way easier and quicker than putting a note in my phone! Even with my sub-optimal handwriting!
And with this i hope to give someone another even better idea for his/her own solution to a similar problem.