What are polycarbonate iPhone cases?

I was searching online for a new case for my new iPhone 5, and one said it was made with polycarbonate material. What is this? Is it hard or bendable? Good or bad quality material? I tried googling it, but couldn't find anything.

How to end a tesco pay monthly mobile contract early?

My 24-month contract ends in February 2013. Nothing wrong with the service, I just want to switch to an iPhone and the best deals are available on other network providers. Would like to end the contract and wondering how much I may need to pay.

A good iPhone 4s screen protector?

My friend tol me that if the screen protector covers the thing next to the front camera then you wouldn't be able to make calls, is that true?
and i just want to know a good screen protector, one that would be easy to apply, and look nice, and gives good protection. Also where i can buy it
I've been looking online for iPhone accessories at amazon and they are so cheap, so hopefully what you guys give me would be findable (if thats a word) on amazon
so can you guys also proide me a link
thanks.

Added (1). Also would this be a good case?
http://www.amazon.com/...005LSTPQ6/

Added (2). Good case? Http://www.amazon.com/Pattern-Design-Iphone-Verizon-Sprint-Brown/dp/B006UT0R0I/

Will the Apple store be able to fix my iPhone?

The "other" space in my iPhone memory is taking up almost 2GB of my 8GB memory on my phone. Most of the suggestions online are just to restore the iPhone but I don't want to do that. If I take it to the store, will they be able to reduce the space the "other" is taking up, have you fixed yours a different way, or is restoring it the only option?
Thanks!

Added (1). The memory from my music, apps, etc.takes up less than 3 GB

What happens when you go oversea with your iPhone?

Okay, this summer I'll be going to Vietnam and I'm wondering what happens
when your iPhone is oversea. Does it lose all of it contents if you go oversea? Does it still work with the phone being oversea? And if you get another sim from Vietnam does it still have the contents like your previous musics and apps and photos that you've have or downloaded?

How to delete undownloaded songs off iPhone 4?

I have an iPhone 4 and when I plugged it into my computer it started downloading all 600 songs into my phone. I immediately stopped the syncing but now on my phone in music it has every song, just in lighter writing saying it wasn't downloaded. It also won't let me delete it off my phone because it never downloaded. How do i delete all of it off my phone?