The Relay secure smartphone for kids by Republic Wireless is so secure that it does not feature a display. This accessory can be considered a basic phone with tracking capabilities for kids, as it features nationwide 4G LTE connectivity, as well as WiFi, Bluetooth, integrated GPS, NFC contact sharing, and even a smart assistant.
https://www.notebookcheck.net/Republic-Wireless-intros-the-Relay-secure-smartphone-for-kids.304248.0.html