Question

Restate Thesis : Cellphones are good because it’s a good way to communicate with the teacher and do better in school.

Answer 1

One way to restate that sentence is to say: "Cellphones are a good way to keep in contact with the teacher and do well in school".

Or you could possibly say: "Cellphones allow you to do well in school because you are able to contact the teacher".

Answer 2

Cellphones can allow you to do better in school, and are a good way to communicate with teachers.