In the next 20 years

I think that in the next 20 years cell phone becomes more growth.
When cell phone was bought in Japan, I was an elementary student.
At that time, cell phone was very different from now.
The newest cell phone becomes more slim, has a variety of design, and has a lot of function.
I can do whatever I want to do with cell phone.
For example I can watch TV, listen to radio, search something with Web site, and so on!
The "i-phone" starts to be bought also.
Cell phone continues to develop more useful.