Answer:
The effects of teenagers on cell phones can differ from person to person, but for the most part: phone have lead to a higher percentage or teenagers being introverted and in some extreme cases even leading to them developing some type of social anxiety or discomfort in interacting with people face to face. On the other side of the spectrum cell phones have made it easier for teenagers to connect based on similar interests and have a space where they can talk about said interests, they can also keep in touch with their school friends easier than only seeing them at school. It truly depends what side you want to look at! Hope this helps :}