I think the smart phones are produced more than ever.

Thanks for doing your homework mr. [이름].

- Blair

Phone are used not in commucation usage but a small gadget for everything.
For older days, phone has a only one function that is communication.
But for now, it is like a small pc.
For that reason, many people from young generation to old use it for many way.
In conclusion, smart phone is increasingly used, I guess.

Phones are not only used for communication nowadays, it has a lot of usage.

In older days, phones are only used for communication. But for now it is like a handy PC.

For that reason, many people from young to old generations use it in many ways.

In conclusion, using of smart phones have increased.