Agree with >>7 but only partially. It's a good idea to get a phone and just make it be a phone, but cheap landfills like Xiaomis' batteries not only will disintegrate even if you don't use them, they're ridiculously bloated and invasive.
Instead what I'd suggest is to just look into something low-end with as few features as possible. You'll most likely not need crap like NFC, fingerprint sensor, A-GPS and the like. Something with Android Go instead of regular one, a slow ass processor and 2-4Gb RAM. You can't estimate bloatware or whether you will be able to disable them, but brands like Nokia and Motorola are known to be bare-bones and whatever you can't disable in the options, you'll most likely cut out with Universal Android Debloater.
Instead what I'd suggest is to just look into something low-end with as few features as possible. You'll most likely not need crap like NFC, fingerprint sensor, A-GPS and the like. Something with Android Go instead of regular one, a slow ass processor and 2-4Gb RAM. You can't estimate bloatware or whether you will be able to disable them, but brands like Nokia and Motorola are known to be bare-bones and whatever you can't disable in the options, you'll most likely cut out with Universal Android Debloater.