Someone else asked this question a while back but I don't think the question got resolved.
My aged Dad has bought a S5 Mini (on my recommendation).
I've set it all up for him but when it comes to the Calendar (S Planner), there doesn't appear to be a Reminder function on setting an event.
On my phone (an S5 Mini bought a year ago) you can go into "More Options" under the "all day" toggle check box and then set a reminder from there. There's no such choice on my Dad's new phone! Where is it?!!
He uses reminders a lot so I really need to figure this out for him.
Thanks for your help !!