My smartphone

Now most people around the world have a smartphone. The smartphone is used for comunication, business, education etc. Smartphone technology has been growing very fast since the beginning of the 21 century. When I was a in senior high school, my smartphone had standard functions for calling and messaging. I replace my smartphone approximately every 3 years. Now my smartphone has an android operating system. I think it is more powerful than the other operating system. I like developing android applications. I have made more than 10 applications since a year ago. I always bring my smartphone everywhere.