Hi! I got my iPhone 4s for a while ago, and I have a sim card from T-mobile if that makes any difference. My problem is that my phone doesn't react when I try to open an app, switch from an window to another, or anything. What happens is that there appears a tiny frame around the app I touch for example. People tell me to restart the whole phone, but what if it will continue happening and I have to restart it and lose my data all the time? At the moment I am living in the US as an exchange student, and in May I am going back to Norway, so if this might happen again it will be more difficult for me to fix this problem.. Please, what should I do? I will restart it for this time, but what if it happens again?