Depends on the phone. I'm using a ~ 4 year old phone with LineageOS. I also have a Russian phone whose userland source code was never released, and no open sour

Depends on the phone. I'm using a ~ 4 year old phone with LineageOS. I also have a Russian phone whose userland source code was never released, and no open source ROM exists; this phone is swimming in vulnerabilities and languishing in Android 6.