https://www.amazon.com/gp/aw/d/B00XAF4J04
As for smartphone, I have a few Pixel 3 XLs I'd like to test graphene and lineage on. In general I'm kind of over smartphones because browsing the web on them (the main thing I do with them) is suboptimal compared to a computer/laptop that can run uBlock and NoScript, so I will probably mostly just leave an iPhone-sized hole in my life.
The Nokia 106 is also good for receiving SMS, which is the only thing I really have a non-data SIM for at this point.
I carry a battery powered gl.inet wireguard/lte wifi openwrt router with me with a Google Fi data SIM in it for internet. I have root on it and can write my own iptables rules, and it only sends traffic via the vpn.
They're pretty painless to use, too; there's an 'Add-ons' option in the main ⋮ menu with an entry for each extension. Tapping an extension's entry opens the usual extension dialogue in a full-screen view, and tapping 'back' in that view has the same effect as closing the extension dialogue on a desktop browser.
So you can use NoScript to enable a script and reload the page in...5 taps. It could be worse.
Also, I don't use Firefox due to its telemetry.