If you're running Windows 10, even "top of the line desktop PCs" engage in data collection these days - I have to turn off pages of settings and set group policies to disable it all properly and even then there are still some things which can't be disabled, like the Bing hit every time you type in the search box even with internet search disabled, so I have to use hosts file blocking.

https://arstechnica.com/information-technology/2015/08/even-...

Android is pretty much as close as you're getting - I'd say it's quite comparable to the situation on desktop PCs today if not a little better because the open source community around it is quite potent. In fact, OnePlus is quite popular in these communities for making cheap, well-spec'd phones with unlocked bootloaders where you're free to have full control over your device.

And all this is missing one of the biggest sources of this spying - apps. Most apps send pretty much everything they can get their hands on when you start them, I launched a game the other day and had it connecting to 6 services for 2 analytics, ads, and crash reporting, all of which were contacted every time the app was started. For this I'm very grateful for tools like XPrivacy and LineageOS's privacy guard which all you to trivially block this and such tools are not commonly available on other platforms.