Will I lose my music if I update my iTunes?

I haven't updated my iTunes since I first got an account back in Christmas of 2010.So I'm getting the iPhone 5 now. Do I need to update the iTunes for my iPhone 5 to properly work + get the full experience? Will I lose all my music by doing so? Because if so, then it isn't worth it.

Basically, I haven't purchased my music from iTunes, I've downloaded it from other places.
Also, will I actually being missing out if I don't update it? I heard that the new iTunes sucks anyways. So if I'm not using iTunes to buy anything, just to store music, is it okay if I don't update it?

If I update my iTunes, will I lose my music?

I haven't updated my iTunes since I first got an account back in Christmas of 2010.So I'm getting the iPhone 5 now. Do I need to update the iTunes for my iPhone 5 to properly work + get the full experience? Will I lose all my music by doing so? Because if so, then it isn't worth it.

Cellular usage being used while I'm sleeping and on Wi-Fi?

I have a iphone 4s on Vodafone's pay monthly.
While I'm using Wi-Fi, my Cellular is being used and it's going up every 5 minutes by KB not MB.
But as you know KB will eventually turn into MB and one day this will have me going over my Data limit (250mb).
I've only tried Double clicking my home button to see if there are any background apps.
I can't think of anything else to try to find out what is using my Cellular data!

Ps: I have push notifications enabled on Facebook/Instagram/Twitter etc but even when i'm not recieving them, something is taking my mb.

Verizon Iphone 4s without data plan?

I have a verizon Iphone 4s. Right now I have an unlimited data plan which I see as a waste of money, since I only use it to check my e-mails or facebook. I asked the guy at the Verizon store if it was possible to remove the data plan and just keep my unlimited texting and minimal calling plan, he said he couldn't do that for me. Is there anyway to get around this? I like having an iphone 4s and using everything it offers, but I don't NEED to check my e-mail/facebook every second, the etra $40 seems like a waste of money. Not to mention I'm paying for four other iphones so it adds up.

Galaxy S3, iPhone 5, or Droid DNA?

I have narrowed down my smartphone search to those three. This will be my first personal smartphone, and want to know the pros and cons of those three, or if anyone here has just some unnatural bias to one of the three.

Broken Iphone. Light doesn't work?

I broke my Iphone so the insurance company sent me another one but it's not working. It turns on and off and it has a passcode on it. It stays on for a few seconds then it turns off. It's hard to explain. It's like it works but the screen and the light doesn't work well. I can get siri to talk and it does things but the light on it is bad I guess. Can someone explain this to me. What's going on and what should I do. Can I take it to the Apple store. I don't want to send it back to the insurance company cause it already took it about a month to get here and I don't want to go through that process again.

Added (1). The touch screen works. What will the Apple store do?