I would get the mifi otherwise no one could use the internet unless you are home with the phone.
Good point, and I thought of that, but I work from home and hardly ever leave home, when I do I take my $5.99 a month tracfone with me, just in case I have an issue. So, I think having cell/hotspot wouldn’t interrupt the family. Right now I have an office phone (landline) and a mifi.
My main concern is that a Smartphone/hotspot might not be as good as a mifi. All a mifi does is be a hotspot so it might do a better than a phone, maybe not???