As far as I can tell it's just the C band frequency range, and radios supporting either generally support both.
bamboo
I addition to the answers others have given, consider the large centralized package repositories for software development: npm, PyPI, crates.io, etc. If you frequently publish packages to these indexes, you often will find name collisions and are forced to come up with clever names. In the case of PyPI specifically, it is even worse because while your pip package might be uniquely named, the actual importable python package may not be, and you end up where two pip packages clobber each other. Java's system is verbose but it is simple and solved this problem decades ago.
That used to be the case, but most phones now use radios that can support necessary frequencies and protocols globally. It's also helped that the network side has also been more standardized compared to the 3g days.
If it's just control systems though, they may be able to run off of a UPS for a day or so.
It's a bit more complicated than that. Your IP can identify you still, if there are few users connecting from that IP. VPNs reduce the efficacy of IP based tracking because they allow you to connect via many different addresses, and every one of those addresses will have hundreds of thousands of users on a given day. It adds a lot of noise that makes any pattern identification useless.
I've gotten good mileage out of just an Ubuntu live image. If the network is working you can install packages via apt like normal, but they include a lot of the basics already.
They have "classes" which I think are supposed to be going in this direction.
I'm not sure I'd agree on no spyware. Systems like OnStar are still tracking locations and are deeply integrated into the car. But at least this is before they subscription-ized basic features.
I'm glad nebula exists as a good alternative for educational content. It has successfully replaced much of the time I previously spent on YouTube.
QtWebEngine is based on blink
The odds you typed that from a device that wasn't at least in part designed in the US and manufacturered in China are quite low.
Even in the US, only some high end phones support mmWave. It's never required for service as the few areas covered by mmWave also have low or mid band 5g coverage too.