not as easy as you think. it really depends on where you are. some places don't even offer landlines anymore, and this will only increase. i am not thinking about right now, but in the future landlines will be gone completely, so this is not a viable solution.

besides you have to consider that all the other kids will not be limited to such a phone.

we need to create communication tools that are "safe" but that kids actually like to use too.

TIL there's people who've never heard of VOIP phones

you are not addressing the second part of my comment.

a voip phone won't solve that either.