[jacobgkau]

If we're talking about the professional angle, businesses certainly use apps and the internet for productivity. There are database apps, point of sale apps, group communication software like Slack or Teams, etc.

I think you're better off attempting to define what you want to block (e.g. social media, academically dishonest websites, and maybe games) than whitelisting only calling and texting as if the smartphone cat's not out of the bag yet.