I can’t speak for everyone, but we are personally finding it frustrating with even three devices. Speaking to the school and teachers is pointless, as the schools are struggling too and are having a lot of difficulty adapting to the new situation.
Although kosher phones are important blah blah blah, they are also rather overpriced and may be out of range for many people (except in Israel where they are dirt cheap). If a kosher phone isn’t an option because of cost, drugstores and supermarkets sell really cheap phones with just voice and text and a pay-as-you-go plan that usually end up costing bupkis, certainly less than you would otherwise spend on a kosher phone.