[#8 analog phone] how about changing my phone to just phone?

I see everybody use smart phone in subway, street, everywhere.

Everyone saw screen on their smart phone.

Smartphone makes interesting life, but it is not happy.

So, how about this?

This app makes smartphone to just phone.

User can set time of lock.

I have no idea about locking the other function on ios.

Maybe possible on android.

If you have more ideas, let you free from busy life, :).