Blue line 'scanning' iPhone! Urgent

I have a really weird problem with my phone. It's relatively new so it shouldnt be having any problems but, everytime i try to do anything, a part of my screen will turn transparent blue and will start moving back and forth like its scanning my iPhone. It will crash whatever i tried to open and then the screen will become unresponsive. I've tried searching the Apple website and restarting my phone but this problem won't go away. This is a huge inconvenience because i need my phone for school and work. Please if anyone has any idea what is going on, please help!

Is it bad to constantly change the time on your iphone?

I'm just curious because I know on the computer when you forward the time by a few hours and go back to the original time… Then do that all over again, it screws up the maintenance, scheduled clean ups and stuff… Basically it ruins the computer… So I was wondering if this "switching the time constantly" also ruins the iphone.

Xperia Z1, Nexus 5 or iPhone 5S? - 1

I'm in the market for a new cell phone in Ontario Canada, replacing my old and tired HTC Amaze 4G. I always believe in getting the best when it is something I hope to use for a long time. The cell technology is confusing and the price range is wide. I don't mind spending a few extra dollars for a better phone. Regarding features, of course, fast and reliable connectivity is important both Wi-Fi and via the cell network. I also travel and exchange the SIM in some countries so it must be unlocked. Being able to use the camera for recording information clearly such as labels etc would be useful. Also, if the pictures were reasonably good, then I would not need my compact camera. I do not want a humongous phone, but I like speed, ease of use and quick access to the features. What do you think? Are you good with the technology and can make a recommendation with the pros and cons. Would greatly appreciate your comments.

Added (1). Thank you Paul for the time you took to explain the benefits of the Nexus 5.It is greatly appreciated.

How to get Cydia on my iPhone 2g?

I just jailbroke my iPhone 2g and I didn't get Cydia. I tried using OpenAppMarket, but none of the Cydia downloads worked. Can someone please help me?