You still use the carrier sim card for a connection. That doesn't depend on what OS you're using.
Cianalas
Unless they changed their minds, personal use isn't going to hit the requests per minute required to trigger needing to pay.
The tankless heater should have a map in the specs divided into zones by average water temperature. There'll then be a table that references the zones and what size you need for what you expect to heat at the same time.
I'm going to try and hit all the checkpoints.
I've got a Kohler, and didn't have any issues with putting a Toto bidet on it.
You could use a nail set so you're not denting up the drywall.
I'd also recommend using a screw to actually hold the drywall in place, since that nail is just going to work out again. But if the nail isn't out enough to easily grab without denting up the drywall, using a nail set to drive the nail back below the drywall will do less damage than other methods.
Even if there's no alien technology, reports will show capabilities and limitations of US radars and other methods of detecting foreign objects. And there's likely stuff about US experimental craft in there as well. Even if outdated, that's something that the DOD isn't going to want out there.