i’m not saying that you can’t but like, you shouldn’t buy a phone with the prospect to turn it into a server. You should sell your old phone. Or use it until it dies. That’s probably going to be better in the long run honestly. You use a laptop? A desktop? An SBC even? All of those can be converted into a server with MUCH longer lifespans, and better software support.
Mobile hardware often has a support period of like 2-3 years, although that’s changed recently, the hardware expectancy is probably more like 5 years at most. Meanwhile, desktop hardware, and mobile hardware in particular can easily last like 10 years. Even longer if you’re ok with running legacy hardware.
My primary mobile laptops are 10 12 years old respectively. They’re perfectly fine for what i need. I would NOT want to be using a 10 year old phone for that.
If you aren’t the type of person buying or owning laptops, you almost certainly do not know what self hosting is.