Kevin DeYoung has an interesting article about the rise of internet addiction, especially for Christians. While the article is primarily about internet and computers, I think the arguments can be easily extended to mobiles phones and television as well. Our constant need for new information and entertainment decreases our attention spans and makes us crave instant information.
In my own life I have observed how these things can easily eat up the time we spend with God. While I do not advocate the view that all media/internet is bad, I do think that we need a certain amount of discretion of what kind and how much of media we consume.
More on the Gospel Coalition.