Its now the Amazon Fire tablet which takes the punishment and doesn’t matter if its set on fire.
For the kids apps I have on my phone I tend to pin before handing to my toddler out and about. If I don’t I would find the settings changed, a few apps installed and watching something inappropriate on YouTube if I glance away for more than 30 seconds.
As for colleagues not so much, they have their own phones or the good ol’ landlines to use to make a call. If its out the office, I’d normally be next to them if they did need to make a call and had run out of battery/no signal etc. I also trust all the people I work with not to be dicks and start installing apps or trying to check out my bank balance. If it was someone I didn’t know I could pin the phone app.