... i didn't know you could get hydroiodic acid by reacting iodine with phosphoric acid!, but according to this document u can-
https://www.thevespiary.org/rhodium/Rhodium/chemistry/mmda.txt (https://www.thevespiary.org/rhodium/Rhodium/chemistry/mmda.txt)
cuz phosphoric acid is alot more available that red phosphorus!