I would also be highly skeptical that the jammer would actually prevent someone in the moment from ceasing to look down at their phone anymore, since 1. most ph

I would also be highly skeptical that the jammer would actually prevent someone in the moment from ceasing to look down at their phone anymore, since 1. most phone operations aren't so heavily dependent on an active internet connection e.g. messages will come in whenever they come in, and 2. having no connection could actually cause them to look even more at the phone, to try to figure out why it's not working or retry whatever they're doing.