Dr Thomas said she often heard similar stories, and "as parents you have the power to make and reverse a decision".
She said: "Parenting is hard and reversing a decision is super hard but in the long term it will work out better."
"It is about having those open an honest conversations with your children."
Dr Thomas said she was aware that teenagers and young people were using social media to connect with others.
"That is great because they can find their team and likeminded people and feel connected," she said.
"But the real world immediate impact is that people don't know how to communicate with each other."
She said that in five years time, it could have an impact on those teenagers' careers.
"Young adults will go into workforces that don't seem to be able to work in the same way that employers do today."
Although she added: "I think there are some things like turning up on time, understanding responsibilities, completing tasks, being a team player and communicate will always be a part of what a work force is."
She advised parents to buy their children brick phones, as an alternative to smartphones, or start a tech-lite group like Phone free Fridays.