If you’re worried about your kids running up the phone bill, why would you want to get a family shared plan. Especially when it’s “anytime” minutes. I had free incoming calls on a plan a few years back and talked 5500 minutes in one month. (For the record I used exactly my 400 peak minutes. Bam.)
You’d end up paying major overages anyway, and it would mean you couldn’t talk on your own phone without paying more overage.
“One thousand anytime minutes. Enough for even the biggest talkers.” You sure about that?