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Funny that you say that. I always get the low end phones so I don't expect much performance-wise. I didn't even know it was possible for me to have a reasonable mobile web browsing experience because Chrome was always so awfully laggy while also making everything else lag and I didn't expect Firefox to be any different. Then I actually tried it, and holy shit the internet actually works. Not only that, I can't even tell that I'm browsing on a shitty low end phone.
The issue I have with wearing a weighted vest throughout the day is that it moves your fitness workload into the parts of your day where you want to reap the rewards of being fit, thereby defeating the purpose of undergoing this journey in the first place. I can't speak for the effectiveness though.
For hiking/jogging, you might benefit from replacing that weight with something more practical, like water or snacks.