Writing prompt: Mobile Phones in Our Life

Student essay:
Hi! John,
I'm glad to hear from you.
Mobile phones are common in own life. In my family, everyone has a mobile phone. I got my first mobile phone when I was thirteen years old. I was so happy when I get my mobile phone.
I usually read e-books and search the Internet with my mobILe phone. My mouther thinks it's bad for me to take a phone, because she thinks it's bad for my study. But my dad thinks it's good for me, because it's can let them know where I am.

Corrected essay:
Hi! John,
I'm glad to hear from you.
Mobile phones are common in our life. In my family, everyone has a mobile phone. I got my first mobile phone when I was thirteen years old. I was so happy when I got my mobile phone.
I usually read e-books and search the Internet with my mobile phone. My mother thinks it's bad for me to take a phone, because she thinks it's bad for my study. But my dad thinks it's good for me, because it can let them know where I am.