If you want a normie phone that you can install a privacy-focused OS on, Google Pixel is a surprisingly good option. Just take a look at the LineageOS's and GrapheneOS's officially supported devices lists before purchasing a specific model. You can also choose Xiaomi or Motorola but you won't be able to lock the bootloader with a custom OS installed on that phones which can create some vulnerabilities. If you want to run Linux on your phone though, you either need a PinePhone or a OnePlus 6 series