firstly, we can use emails because it's so easy and more fast for see the emails. Secondly, call with some people, because you can send messages,finaly use Internet, if your mobile phones have 3G or wi-fi.
Mobile phone had disadvantege too. Firstly, people can be crazy for use the apps, because the games and others apps are so addictive. Secondly, listen to music and use internet. Finaly,call with friend and send message because this is so fast and the person like so much talk with her friend in a few minutes.
Some people need help depending on the case. Today, everybody use mobile phones but in my opinion this is not good because some people be addicted and this person can be problems cause mobile phone is only thing he want to use, for play a game, use Internet etc.
