I wanted to keep my unlimited data so I just purchased the galaxy s3 from someone on craigslist. I thought everything was working fine until i started typing on it and it wouldnt keep up with my typing. I thought it was because it was a different phone I had from before but it would sometimes miss certain letters when I type. Then I started browsing and scrolling and it would sometimes miss certain times when I swipe. Once I noticed that something seems to be wrong with the phone I started swiping away back and forth then I really figured it out that the touch screen sometimes misses certain times when touch the screen. Like its just not registering at certain times. Please help if you know of any type of problem like this. Searched the forum but I couldn't find anyone with this problem. thanks