Why would you ever be buying a sim card seprate from the carrier servicing it...?
Honestly asking, that's incredibly unusual to me. Where I live, the mobile carrier always provides the sim card. Usually free with a monthly phone plan, or as a part of a pre-paid plan. (pre-paid you can usually buy from a corner store like seven eleven. monthly you'll actually have to visit their store/mall booth)
It's incredibly unlikely that you'd be in such a bad accident that you couldn't call for help; while simultaneously being isolated from the public to the point nobody saw your accident and started calling ems/police before you could.
That's not to say it doesn't happen; but I definitely wouldn't be worried about it.
True; but it's made much easier when you've destroyed all the infrastructure that keeps those phones/cameras charged and transmits the photos and video.
Batteries only last so long, and you've still gotta be able to send the data somehow.
A usenet client such as SABnzbd. This is equivalent to a torrent client like qbittorrent.
An NZB indexer such as NZBGeek, again equivalent to torrent indexers, but for nzb files.
And finally a usenet provider such as FrugalUsenet. This is where you're actually downloading articles from. (there are other providers listed in the photo in my other comment here)
Articles are individual posts on usenet servers. NZB files contain lists of articles that together result in the desired files. There are also additional articles included so if some are lost (taken down due to dmca/ntd) they can be rebuilt from the remaining data. Your nzb client handles the process of reading nzb files, trying to download the articles from each of your configured usenet providers, then decompressing, rebuilding lost data, and finally stitching it all together into the files you wanted.