giving kids smartphone, watever smartphone is just stupid and dangerous

they get hooked on it

give them a simple dumbphone they can use to call and whatsapp

if u want to give them something for entertainment, buy a nintendo console for home use everyone can play with. Easier to monitor and control.

If it were me, I just buy them toys. Gunpla, boardgames or those educational types. A lot cheaper, and fsr less harm.