How Do You Use Your Smartphone?

Many people have their own cellphones nowadays, and they usually prefer to use smartphones instead of feature phones. I was a feature phone user one year ago because I couldn't find any reason to buy smartphone. Now I'm a smartphone user and it is more comfortable and useful than I've expected. (Alternate phrasing, you could say: "than I would have expected" instead.)
I use my smartphone like this: (Alternate, "Here are the ways I use my smartphone:")

1) Chatting on the messenger with friends
You can see There are various kinds of on-line messengers such as Kakao talk, Line, QQ, and Telegram which I use often now. After chatting on the messenger by via smartphone, I could can save my money for on my phone bill because there is no need to pay for a each texting. And it could be is possible to talk whenever I want, wherever I am.

2) Using it as my dictionary
When I studied in Moscow, I only had to use a paper dictionary to use. But a friend of mine, who is from Japan, used his smartphone as Russian dictionary. It seemd more useful because the online dictionary showed more meanings of word and more phrases. Now I also use my smartphone as my dictionary and it is wonderful. Even I'm even using it when I write my notes on italki. (Or saying "this note" instead of my note would also work. :) )

3) My Smartphone is my Yoga teacher
I have a headaches. When it they comes, I can't do anything at all. One day, I decided to find some video clips which show me ways to do stretches or yoga so that I'll be free of headaches. I've got some videoclips and do yoga every morning watching my smartphone. I've been doing this for about a month and it works well for my headaches. I'm almost free of it. (In the context it's obvious that this is an event which occurs more than once so therefore headache should be pluralized.)

You did an excellent job writing this, almost the only mistakes you made were to do with tenses. :D