oh another question. what's the downsides of using a phone that google will not provide any updates to? is it like certain apps will stop working all of a sudden?
Hmm no. In general you'll see something like... the next two years you won't get OS updates which is, fine. You don't need those features, anyways, y'know? The security updates are a bit more concerning to go without, but ehhhhh you're not the Prez, you'll probably be fine.
After two years, apps will start to not update on the Play Store. Google raises minimum SDK versions for apps uploaded every so often and generally, apps want to target new OS versions to get new/easier/QoL features. So after a year or two, your app updates will dry up. However, due to APIs being generally resilient, you'll still be able to use your existing apps for a while.
Let's say another year. We're three years out, I guess. After this point, you'll start getting annoying banners in apps if you haven't already. "Upgrade soon or lose access!" Etc. Then the dates listed will come to apps and voila, you won't be able to use such cloud-dependent apps anymore.
Assuming you haven't been hacked or phished or cracked either remotely or locally due to about a dozen zero-days getting released for your phone model over the last year, your existing apps still become an additional liability and attack surface. Like a sun collapsing in on itself to a dwarf star or black hole, such is the case of unsupported phones after ~3 years of additional use.
In my experience, anyways.