At the same time, the phones, have a lot of disadvantages. Firstly, the phones make the people anti-social or rare. Secondly, you pay a lot of money every month for the phone or the electricity. Thirdly, you can't study well if you have a phone near you because you heard if someone pass a message or anything. They are so bad for the concentration and, if you spend a lot of time with it, probably you can have headache.