I am not surprised by the report but what I would like to see is a child phone. Something for safety and security, useable by any child of any age.
A mobile that can take calls but only dial out to numbers programmed in by the parents or guardians using a pass code.
This way you could control the use of the phone and always have the reassurance of contact at any time. The report says that 68% of parents bought their kids phones to keep tabs on them, bearing in mind the cost of phones a dedicated child phone would be far cheaper and more accessible to low income families.
Things have changed a lot in the last 10 years and mobiles are as common as watches so let the kids have them but for the right reasons.