Earlier quoted context omitted.
Which companies? Where can we read more about the no-TX design?
I heard about it years ago probably from WP: https://en.wikipedia.org/wiki/Pager#Security It's very inefficient because every tower must broadcast every message. This is why you can find an archive of pages from the morning of September 11th online, they transmitted unencrypted to a huge area. So that raises costs and limits the coverage area. Fine for a hospital with 100 idk doctors who need paged, not fine for cont…
No, it's incredibly efficient because the messages are tiny.
If you need to send a long message, then you page the person with "you have a long message from XYZ, please use higher-bandwidth mechanisms to retrieve it".