If you're concerned about your child's obsession with your phone, you may want to do an inventory of yourself first. Our kids take cues from us, so if we're constantly connected, they will want to be too. Create "no phone zones"- times or places in your home where phones are put away and placed on silence. This could be during special play time, meals, after 6:00pm, etc.
Check out this mom's realization about why her kiddos were so drawn to her device.