We should allow college students to use mobile phone.
There are several reasons.
First, we can contact with each other easily. Mobiile phones can be carried everywhere. So if we have mobile phones, we can call someone easily. We don't need to go everywhere to search for telephones.
Second, it is cheaper than calling. In addition to calling other easily, we can send text messages to each other, and it is cheaper than calling others. In this way we can save money.
Third, we can know what's happening around the world easily. Now we can surf the Internet on our mobile phones. It is much easier and more convenient. We don't need to carry our laptops. Mobile phones are lighter and easier for us to carry. So we can know what is happening around the world easily.