Kidsphone Options? (Post 3g Sunset)

Most decent looking kids phones are (figuratively) locked to the major 3 carriers. Their main features (GPS etc) do not work unless you are a contract, and the sim menus are often hidden.

I do not want smartphones with software restrictions for my child. Just something boring and utilitarian.

It seems something like the BOT talk might also be a good option.

I am with iijmio so I need band 19, but I would switch carriers if there was a better workaround etc.

Any input?

by Choice_Vegetable557