Security is topic that is definitely worth taking very seriously, and worse, it's in contrast with an industry fundamentally designed around planned obsolescence.
I don't have estimates, but I think it's safe to estimate that there are millions of otherwise perfectly valid phones that either are in use, with serious vulnerabilities (in particular, bluetooth ones) and are not going to be patched, or have been thrown away because of that.
I don't have estimates, but I think it's safe to estimate that there are millions of otherwise perfectly valid phones that either are in use, with serious vulnerabilities (in particular, bluetooth ones) and are not going to be patched, or have been thrown away because of that.