Comment by Uptrenda
Good luck. Almost every service you need for a smart phone to be "smart" anything requires being part of the Google or Apple botnet. Yeah, you can install whatever crap you like on your phone. Maybe it will do SMS? Kewl. Want maps, mobile banking, 2-factor auth, different password managers, music streaming, and so on... good luck without one of the app stores. Also, being unplugged sometimes means your phone won't even work for calling beyond SMS. Since its baked into the ROM image and you have to hope that the devs have added support for your hardware. So you trade a smart phone (a useful device for the modern world) for a goofy neckbeard terminal in your pocket (too small to be used for any complex input.)
You can do a lot of this on the web.
Hang on, did you just cite 2-factor auth as something that requires a proprietary app? And password managers?