Telephones are certainly good, because with the help of fast communication we can help someone and can develop our business faster. We will return to the stone age and we will be very difficult to survive.
You say the right phone is very useful for us. It gives us many advantages in communication. Smartphones like iphone, samsum, htc ... can help you send mail, store data, locate, face, zalo. Life today is hard if we do not have a phone.