How would you arrange it practically though? You would have to distribute sim cards, and people would have to swap those out with their normal sim card renderin

How would you arrange it practically though? You would have to distribute sim cards, and people would have to swap those out with their normal sim card rendering them unreachable by phone. That's ofcourse assuming their phone isn't carrier-locked. Wifi seems a lot more practical unless phones are redesigned to cover this usage pattern.