i've started to just chuck it somewhere if I'm trying to focus
When I got a new phone about 6 months ago, I spent about a week horrified by the number of notifications that I was getting by default.
That, and keeping the charger in a remote corner, helps to park it and forget it.
Also, disable face/fingerprint/pin unlock, and use a longish password, so unlocking it isn't convenient.
A bit different, but good if you want a break.
1) The majority of people disable the feature after a short time (if they needed it in the first place, it's hard to maintain the self-control to keep it enabled, when it's presumably trivial to disable), and
2) Whether the cognitive effects remain, even when it's locked, because the mere presence of the phone makes you think about it, and it being locked makes you think about what you're missing.
(No affiliation, just a happy user)
Of course, on wifi, it can do everything that phone with a normal data plan can do. I just don't bother, because most of the time I'm on wifi, I have a laptop available. Especially these days.
Also, based on location, I automatically disable all notifications while at the gym or in a restaurant. If a had an urge to access it anyways, I might set the brightness to zero too.
I wonder if there is a way to accomplish many of these things while still carrying your phone? For example, what if your phone took 5 minutes to unlock? And didn’t give notifications until you unlocked it?
Just a thought.