Good day!
Hi!
There are routers that has a sim slot (or simply pocket WiFis)? Maybe what he meant is just to connect to such device though it does not subscribed to any internet access promo (obviously, can't browse) and through psiphon, he will then be able to access internet.
AND I doubt it is possible. I'm not an expert, but I guess, psiphon depends on pocket data config of the phone too. Na yung wifi conn., eh di na naman na ginagamitan ng config. sa phone.
Just try to read threads for the right configs., etc. (Consider factors such as location, etc.)