I agree with the lady of the listening recording excercise, some tecnological device as mobil phone makes us to be more private with other peoble as if did'nt have them.
Por example if we are on the bus stop, we normally talk with some other people. But by the other hand mobile telephones can help you to go out from a difficult situation.
I remember when I bought my first mobile phone, all my friends started laughing at me and critisized me, but them we got inside an elevator and it gots crached. Thaks to my mobile phone we could phone the Company and they come to rescueted us.
It was sunday, and it was in agost, so nobody heart us crying and asking for help.
Then when we got out fron the elevator I saw them: You can see how much can it be usefull for.