Would someone correct this for me?

I have a mobile phone 'Galaxy Core.' I bought it a year ago. At first, I had problems with it because didn´t work, the mobile phone it was defective.

What is for use the/a mobile phone used for? I use my mobile for almost everything. I mean, I usually look for some information about the topics that interest me. I also use it to read English news, BUT However, specially I use it especially to keep in touch with my family, friends and my coworkers through calls or and texting messages or text messages and sometimes, I use it to send videos. I also take some photos when I travel.