In his commentary on Ephesians 6:4, St. John Chrysostom wrote, "Let everything take second place to our care for our children, our bringing them up in the discipline and instruction of the Lord. If from the beginning we teach them to love true wisdom, they will have greater wealth and glory than riches can provide."
For the saints of the Church, raising our children responsibly and instructing them in the ways of the Lord is our chief responsibility. When it comes time to give your child a cell phone, it's important to take St. John Chrysostom's words to heart. Don't simply give them the phone. Rather, teach them responsible and appropriate uses. Engage them in an ongoing dialogue. Help them cultivate good habits.
"With great power comes great responsibility" is a phrase frequently used in the Spiderman comic books. That phrase is also applicable to kids and cell phones. Cell phones are powerful communication tools that can easily be misused and abused. Help your child understand the great responsibility that comes with the privilege of a cell phone. Through your Christ-centered guidance, you will be fulfilling the words of St. John Chrysostom with those entrusted in your care.
 St. John Chrysostom, Commentary on Ephesians 6: Homily 21.