Respected Principal Sir,
I hope this letter finds you in the best of health. I am writing this letter to apologize for my recent conduct in the classroom. I am fully aware of the fact that the school administration had barred the students from bringing any mobile devices in the school’s periphery. I admit that I have committed a mistake and would not repeat it in future.
Please, reinstate me in the school so that I can complete my studies and prepare wholeheartedly for the upcoming exam. Also, your goodself is requested to return the confiscated mobile device so that I can give it back to its real owner. I would be highly obliged if my request is considered and my apology letter is accepted.