Depends upon the maturity of the child, and if they are "responsible".
One of my boys has had a phone for 2 years, and one had a phone and lost it, along with the charger....he's very absent-minded, loses keys, wallet, etc.! So no phone for him, he's not responsible!...He's angry at present....(not my problem)....He's gotta "man up" before he'll get another phone! And it won't be for Xmas.