Parents who are indifferent toward their children and relatively unaware of their childrens lives are described as

I believe the answer is: Neglectful/uninvolved parents

Neglectful/uninvolved parents is characteriszed by the lack of responsiveness toward the children and  lack of trying to understand the needs of the children.It iis very common among Neglectful/uninvolved parents to simply dismiss the children every time they try to communicate or even treating the children like they don't exist.

Old telephone. is prehistoric object