[masenf]

Based on the other projects on the site, it looks the author is a licensed amateur radio operator.

You are correct that in the US, most personal/unlicensed (Part 95) radio services explicitly prohibit phone patch via FCC rule 95.349 [1]

[1] https://www.ecfr.gov/current/title-47/chapter-I/subchapter-D...

[Gordonjcp]

It may well be similar to the situation in the UK, where - while it is not really within the terms of a licence for (for example) unlicensed 446MHz radios, no-one is going to do anything about it.

In the US the FCC will go after you for running half a watt over your power limit. In the UK, Ofcom literally cannot be paid to take an interest on what happens on amateur or ISM bands, and will only get involved if you're making a nuisance of yourself on commercially licensed frequencies.