Hopefully, there's enough people that just want a general purpose computer with and open source operating system that just happens to include cellular

Hopefully, there's enough people that just want a general purpose computer with and open source operating system that just happens to include cellular internet connection (bonuses for me would be a a hardware keyboard, is at a size that actually fits in your pocket and has a hard switch to disconnect it from the network) There aren't. I'm sorry, but the number of people who actually truly care about "general purpose computing" and privacy just isn't high enough to form a viable market segment for any but the most specialized of hardware vendors. If it were not the case, we'd have seen a lot more phones with truly open hardware and software stacks. That said, if you're willing to relax the "pocketability" requirement, a laptop running GNU/Linux and tethered to your phone fulfills every other requirement. (PS: What is it with the "hardware keyboard" requirement? It's not like you're going to be writing the next great American novel on your phone. For text messaging and short e-mails what difference does it make?)