How to delete backed up files on pc for iphone?

So basically i upgraded my ios to 6.0.1. I backed up my data before i did it so i don't lose anything important and retrieved it back now. I want to know how to delete the data on the computer because it was my cousins computer i used and i had important and private contacts/ messages on my phone.

How good is the service on the virgin mobile iPhone?

I've had virgin mobile for about 3 years, and love how much money I save, (about 50 bucks a month), but the service is HORRIBLE. The internet is almost too slow to do anything, and that's even if I can get it to work in the worst place (I usually have to turn airport on, then turn it off, and disconnect the Wi-Fi to get it to work, i don't know if it's the phones I've had, or Virgin mobile.)
Does anybody have any experience with the virgin mobile iphone, have you had any trouble with it, and compared to, say, a verizon iPhone, what are the cons?

Is silicone case for iphone 4s good enough for safety?

I've seen many YouTube videos and the iPhone 4s doesn't break even when dropped face down w/ a simple silicone case? Is that always true? Just wanna make sure before I buy one, first time being an iPhone girl thanks.

How to get Facebook notifications on iPhone 4?

I have an iPhone 4 along with the Facebook app but the it doesn't show up in the notification centre. It's the same on my iPod and I can't figure out why. I have tried deleting the app and downloading it again but nothing works. I have also looked inside the app itself and all of the boxes are ticked under notifications. Does anyone know how I can get push notifications from my Facebook app?
Thank you.

Added (1). It doesn't show up in my notification center. (in settings)

What is the best Mobile Network for the UK?

I have an iPhone 4S and i'm currently on O2. My contract is up for renewal and i was just wondering, what is the best network to be on in the UK?

Also I mostly use my phone for the internet so what is the best network for internet?

Can I cut my sim card to a micro sim

Hi, I have a cheapy phone from net 10 that has a standard sim card and I don't know if I can cut it to a micro sim for an iPhone 4. I read this forum online a few minutes ago, it says that that lady couldn't cut it because it was too big or something. Is that true? Buying the micro sim is no problem, its just that I have to call in and ask to transfer my phone number then I have to wait 24 hours, you know, lots of works compare to just cutting my sim card.