Dear professor Gary,

    I'm (terrible) sorry for using the mobile phone in your lecture last week.  I admit (make) a mistake and I deserve any (punish) for being such a rude student. But I didn't use the mobile phone design. I was trying to find a part-time job and that day, a company e-mailed me a job offer and I (require) to present my further information without any delay. As result, I had to try (send) them a text message in class. I promise it will never happen me again. But I do need my phone with I could communicate with others. I would be grateful you could give it to me this time.

    Thank you.

Tom