I just recently bought the Galaxy S4 which is my first android phone and I love it. The only issue is that my swipe to unlock keeps breaking. Sometimes it randomly just stops letting me unlock my phone unless I go to my notifications and then change my lock settings to something else like the pin and then back to swipe to unlock. My screen isn't broken or cracked. All of my lock screen widgets work just fine and when I do get my phone unlocked there are no issues.