I would explain to the student and the parents that while there may not be any rules at home, there are rules and expectations in class and consequences for not complying. You must be prepared to enforce the consequences, so make sure they're reasonable and appropriate. I would ask the student to opine on why he/she isn't doing the work or being respectful in class. Attempt to get to the root of the problem and that may help with the solution.

This is a difficult situation. If I were the teacher in this situation I would first recommend taking their phone away, because that is only making the disrespect worse. If this doesn't do anything I would recommend them having the student talk to someone neutral, such as a counselor or therapist and try to get to the bottom of what is going on. I would implement some type of reward maybe for attending therapy/counseling session, such as: you can have 30 min of phone time for every session you attend IF you agree to try and be more respectful and to try harder in school.

I would sit both the parents and student down and explain very clearly; there is a way to act at home and there is a way to act in school and in public. As a teacher, there isn't really anything we can do about home life but we can set clear expectations for the school setting and that they need to apply how they act in school to how they will act in the real world when they get a job. No company will hire someone who is disrespectful and act like everything is a joke

In my experience if a student shows no respects for the parent, you acting as an authority figure is not going to be effective. Pending the severity of the behavior an alternative school may be an option. Putting the safety of the students in your class first is always a teachers' obligation.

Create solutions with parents so the kid is able to learn

Involve some of the other administrators to gain perspective

Send him to the school counselor

Involve the principle if it turns into a serious matter

Ask other parents what methods they use

Restrict technology access to the kid

Take away some of his distractions so he can focus

Get him a tutor, there is a possibility he will change in that environment

I would reinforce that cell phones aren't allowed and are a distraction in class. I would also discuss these issues with the parents and go over your classroom policies. If needed I would discuss these issues with administration if the problem can't be revolved.

Create rules and set them in place. explain to them that there are rules and consequences will be given to any misbehavior. explain the rules and consequences.

Well do you have control in your classroom of him ? That's good starting point, then from there you can build rapport with the student and maybe eventually see why the student lacks respect for their parents. While the student seems to blame, the parents also play a roll in holding bounds and expectations their child is to follow.

The parents might not be able to force their child to be respectful or work in the classroom, but they can implement procedures and rules at home to help mitigate their child's behavior and direct toward being a more respectful person who values hard work. Given that child is consumed with this phone during serious conversations suggests that confiscating the device could be a helpful first step. Cell phones and their access to social media subjects children to a multitude of influences that could be detrimental to their interpersonal and academic functioning.

Ask his friends if they can help him in class

I think the first step would see if the parents have any sort of restrictions on their child's phone. If not then I would suggest limiting their screen time and expose to the internet.

I would give them suggestions and try to work together to see what can help.

There are rules expected to be followed in the classroom and when those expectations are not met, consequences follow. I would explain that this students grade will suffer if the work is not completed. It sounds harsh but the same expectations must be kept for all students. Teachers should be understanding and there can be exceptions for example if an email is sent about a death in the family, a divorce, an emergency, etc. Deadlines may be extended and extra credit opportunities may be given but if this behavior is bad enough to warrant a meeting, these parents may need to seek professional counsel.