Hey :)
Erm i know that for me if i can just forget about things somehow then i can feel alot better. Going out on days can work great, if i feel angry, upset etc, then its a nice relief that i can distract myself by doing something fun with my time.
I think its a great idea that the phone was left at home, i know as a teenager my phone is really important, but in the past it has been a cause stress. So yeah, thats a brilliant idea, it gives you space and lets you just focus on other things.

I think it varies alot, some days may differ form others, but as an overall thing i would definitely approve your idea, i think it can really work